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1.
© Art Traynor
2011 Mathematics Definitions Expression Formula A concise symbolic expression positing a relationship between quantities Function A Relation between a Set of inputs and a Set of permis- sible outputs whereby each input is assigned to exactly one output Equation A symbolic formula, in the form of a proposition, expressing an equality relationship Proposition A declarative expression asserting a fact whose truth value can be ascertained Univariate: an equation containing only one variable Multivariate: an equation containing more than one variable (e.g. Polynomial) Linear Equation An equation in which each term is either a constant or the product of a constant and (a) variable[s] of the first order Symbols VariablesConstants Designate expression elements consisting of: Functions Definitions – no Page # citation An alphabetic character representing a number the value of which is arbitrary, unspecified, or unknown A finite combination of symbols, of discrete arity, that is well-formed Operands ( Terms ) Operations Transformations capable of rendering an equation or system of equations into equivalence As in a differential (e.g. Differential Equation) As in a coefficient Trigonometric Functions
2.
© Art Traynor
2011 Mathematics Expression Mathematical Expression Algebra A Mathematical Expression is a precursive finite composition to a Mathematical Statement or Proposition ( e.g. Equation) consisting of: a finite combination of Symbols possessing discrete Arity Expression A finite combination of symbols, of discrete arity, that is well-formed that is Well-Formed
3.
© Art Traynor
2011 Mathematics Arity Arity Expression The enumeration of discrete symbolic elements ( Operands ) comprising a Mathematical Expression is defined as its Arity The Arity of an Expression is represented by a non-negative integer index variable ( ℤ + or ℕ ), conventionally “ n ” A Constant ( Airty n = 0 , index ℕ )or Nullary represents a term that accepts no Argument A Unary or Monomial has Airty n = 1 VariablesConstants Operands Expression A relation can not be defined for Expressions of arity less than two: n < 2 A Binary or Binomial has Airty n = 2 All expressions possessing Airty n > 1 are Polynomial also n-ary, Multary, Multiary, or Polyadic
4.
© Art Traynor
2011 Mathematics Arity Arity Expression VariablesConstants Operands Expression A relation can not be defined for Expressions of arity less than two: n < 2 Nullary Unary n = 0 n = 1 Monomial Binary n = 2 Binomial Ternary n = 3 Trinomial 1-ary 2-ary 3-ary Quaternary n = 4 Quadranomial4-ary Quinary n = 5 5-ary Senary n = 6 6-ary Septenary n = 7 7-ary Octary n = 8 8-ary Nonary n = 9 9-ary n-ary
5.
© Art Traynor
2011 Mathematics Equation Equation Expression An Equation is a statement or Proposition ( aka Formula ) purporting to express an equivalency relation between two Expressions : Expression Proposition A declarative expression asserting a fact whose truth value can be ascertained Equation A symbolic formula, in the form of a proposition, expressing an equality relationship Formula A concise symbolic expression positing a relationship between quantities VariablesConstants Operands Symbols Operations The Equation is composed of Operand terms and one or more discrete Transformations ( Operations ) which can render the statement true
6.
© Art Traynor
2011 Mathematics Linear Equation Linear Equation Algebra An Equation consisting of: Operands that are either Any Variables are restricted to the First Order n = 1 Linear Equation An equation in which each term is either a constant or the product of a constant and (a) variable[s] of the first order Expression Proposition Equation Formula n Constant(s) or n A product of Constant(s) and one or more Variable(s) The Linear character of the Equation derives from the geometry of its graph which is a line in the R2 plane As a Relation the Arity of a Linear Equation must be at least two, or n ≥ 2 , or a Binomial or greater Polynomial
7.
© Art Traynor
2011 Mathematics Linear Equation Equation Standard Form ( Polynomial ) Ax + By = C Ax1 + By1 = C For the equation to describe a line ( no curvature ) the variable indices must equal one ai xi + ai+1 xi+1 …+ an – 1 xn –1 + an xn = b ai xi 1 + ai+1 x 1 …+ an – 1 x 1 + a1 x 1 = bi+1 n – 1 n n ℝ 2 : a1 x + a2 y = b ℝ 3 : a1 x + a2 y + a3 z = b Blitzer, Section 3.2, (Pg. 226) Section 1.1, (Pg. 2) Test for Linearity A Linear Equation can be expressed in Standard Form As a species of Polynomial , a Linear Equation can be expressed in Standard Form Every Variable term must be of precise order n = 1
8.
© Art Traynor
2011 Mathematics Definition Unit Circle/Standard Position Definitions Trigonometric Functions A Unit Circle is formed by superimposing a circle of radius = 1 over a rectangular coordinate system x y A (1, 0) P (x, y) l1 l2 O U θ Ray/Line Segment l1, formed of points ‘O’ (0,0), the origin, and ‘A’ (1, 0), (the “initial side”) is rotated counterclockwise (positive direction) to a point ‘P’ (x, y) Terminal Side Initial Side t θ = ‘ t ’ radians Ray/Line Segments l1 and l2, forming an angle AOP whose measure is θ “Standard Position ” is defined as an angle so situated with its vertex at the origin and its initial side aligned on the positive x-axis
9.
© Art Traynor
2011 Mathematics Definition Angular Measures Trigonometric Functions x y A (1, 0) P (x, y) l1 l2 O U θ = 1 Degrees: Terminal Side Initial Side t = 1 θ = ‘ t ’ radians 1° = 1/360th of a complete revolution about the unit circle n One Minute ( 1′ ) is 1/60th of a Degree n One Second ( 1″ ) is 1/60th of a Minute Radians: A standard unit of angular measure wherein arc ‘AP ’ is identical in length to the initial side ( line segment/ray ‘OA ’ ) of AOP superimposed over the unit circle n OA = OP = AP = t = θ = 1
10.
© Art Traynor
2011 Mathematics Definition Angular Measures Trigonometric Functions x y A (1, 0) P (x, y) l1 l2 O U θ = 1 Degrees: Terminal Side Initial Side t = 1 θ = ‘ t ’ radians 1° = 1/360th of a complete revolution about the unit circle History – Origin of Convention n Undetermined: Ancient Persian calendar evidence suggests the days of the year were numbered at three-hundred sixty ( 360 ) o Coincides with ancient astronomical observation correlating the progress of the sun’s rising to 1° per day o Also has a correspondence with the ancient world of sexagesimal (base 60) number systems.
11.
© Art Traynor
2011 Mathematics Definition Angular Measures Trigonometric Functions x y A (1, 0) P (x, y) l1 l2 O U θ = 1 Degrees: Terminal Side Initial Side t = 1 θ = ‘ t ’ radians 1° = 1/360th of a complete revolution about the unit circle History – Origin of Convention n Undetermined: o Progression of the Sun’s Rising o Sexagesimal Numeration Correspondence. Still used in modern times in measuring angles, geographic coordinates, and time Came to the Greek world by way of the Babylonians
12.
© Art Traynor
2011 Mathematics Definition Angular Measures Trigonometric Functions x y A (1, 0) P (x, y) l1 l2 O U θ = 1 Degrees: Terminal Side Initial Side t = 1 θ = ‘ t ’ radians 1° = 1/360th of a complete revolution about the unit circle History – Origin of Convention n Undetermined: o Progression of the Sun’s Rising o Sexagesimal Numeration Correspondence. Babylonian geometers partitioned a circle into precisely six sectors defined by by the Equilateral Chord Triangle ( which was then subpartitioned into 60 equal sub-intervals )
13.
© Art Traynor
2011 Mathematics Definition Angular Measures Trigonometric Functions x y A (1, 0) P (x, y) l1 l2 O U θ = 1 Degrees: Terminal Side Initial Side t = 1 θ = ‘ t ’ radians 1° = 1/360th of a complete revolution about the unit circle History – Origin of Convention n Undetermined: o Progression of the Sun’s Rising o Sexagesimal Numeration Correspondence. The number sixty also ( coincidentally ) enjoys some highly useful properties Superior Highly Composite Number Has 12 factors : { 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60 }
14.
© Art Traynor
2011 Mathematics Definition Angular Measures Trigonometric Functions x y A (1, 0) P (x, y) l1 l2 O U θ = 1 Degrees: Terminal Side Initial Side t = 1 θ = ‘ t ’ radians 1° = 1/360th of a complete revolution about the unit circle History – Origin of Convention n Undetermined: o Progression of the Sun’s Rising o Sexagesimal Numeration Correspondence. The number sixty also ( coincidentally ) enjoys some highly useful properties Has Three Prime Factors { 2, 3, 5 } Particularly convenient for time : { 30-min, 20-min, 15-min, 12-min, 10-min, 6:1-min }
15.
© Art Traynor
2011 Mathematics Definition Angular Measures - Radians Trigonometric Functions x y A ( 1, 0 )P ( -1, 0 ) l1l2 O U θ = 180 ° Terminal Side Initial Side t = π θ = ‘ t ’ radians When the terminal side of AOP, ( line segment/ray ‘OP ’ ) is rotated halfway through the unit circle, ‘P ’ becomes aligned with the x- axis at ( -1, 0 ), θ = 180° Circumference of a Circle: 2πr implies that ½ the circumference of a circle is πr , and superimposed on the unit circle: OA = OP = r =1 AP = t = π 180° = π radians π 180 1° = 1 radian = 180 π( ) ° ≈ 57.29578° ≈ 0.01745 radians
16.
© Art Traynor
2011 Mathematics Definition Angular Values – Common Angles Trigonometric Functions x y U 0 ° :: 0 Π 6 30 ° :: Π 4 45 ° :: Π 3 60 ° :: Π 2 90 ° :: 2Π 3 120 ° :: 3Π 4 135 ° :: 5Π 6 150 ° :: 180 ° :: Π 7Π 6 210 ° :: 5Π 4 225 ° :: 4Π 3 240 ° :: 3Π 2 270 ° :: 5Π 3 300 ° :: 7Π 4 315 ° :: 11Π 6 330 ° :: 360 ° :: 2Π Twos Sixes Fours Threes 30 ° 45 ° 60 ° 90 ° 120 ° 135 ° 150 ° 180 ° 210 ° 225 ° 240 ° 270 ° 300 ° 315 ° 330 ° 360 ° Π 6 Π 4 Π 3 Π 2 2Π 3 3Π 4 5Π 6 Π 7Π 6 5Π 4 4Π 3 3Π 2 5Π 3 7Π 4 11Π 6 2Π
17.
© Art Traynor
2011 Mathematics Definition Central Angle Properties Trigonometric Functions x y A B O U θ Length of a Circular Arc: Where an arc of length s on a circle of radius r subtends a central angle of radian measure θ, then n s = r θ r A Central Angle of a circle is an angle θ whose vertex is positioned at the center of the circle such that the arc bounding the circular sector ‘AB ’ is said to Subtend θ , such that: s Area of a Circular Arc: Where θ is the measure of a central angle of a circle of radius r , then the area A of the circular sector determined by θ is given by n A = ½r 2 θ
18.
© Art Traynor
2011 Mathematics Equality Unit Circle Properties of Triangles x y O U Begin with the Unit Circle of Radius = 1 ① ① r = 1 ② Introduce Line Segments (Chords) between each of the points of intersection with the Unit Circle and the coordinate axes ② ② ② a Note this forms a square b The diagonal of the square is equal to r + r = 2r or 1 + 1 = 2 c Note that the top half of this square forms two equal (right) triangles 2 d By the Pythagorean theorem, the length of the Chords are 12 + 12
19.
© Art Traynor
2011 Mathematics Equality Unit Circle Properties of Triangles x y O U r = 1 2 ③ Any one of the three Rigid Motion Transformations, can be applied to demonstrate Equality ( one triangle can be superimposed on any other ) a Rotation b Translation c Reflection
20.
© Art Traynor
2011 Mathematics Transformation Transformation A Transformation is a species of FMM (Function~Map~Morphology) which Maps Elements ( as of a Set ) of one Metric Space to another Metric Space ( or to a Subspace of itself ) FMM Rotations is well-defined for all Inner Product (Sub) Spaces Active or Alibi Transformation: A Domain Element of the Transformation Set is assigned a to a non-identity CoDomain Element Species: Passive or Alias Transformation: The Domain Element of the Transformation Set is an identity to its CoDomain Element with the Transformation operating on the coordinate system effecting a change in Basis
21.
© Art Traynor
2011 Mathematics Transformation Transformation A Transformation is a species of FMM (Function~Map~Morphology) which Maps Elements ( as of a Set ) of one Metric Space to another Metric Space ( or to a Subspace of itself ) FMM Rotations is well-defined for all Inner Product (Sub) Spaces Scalar Multiple: Expansion if the scalar is positive Dilation if the scalar is negative Species: Rotation: Points constituting an axis remain invariant while all other points are mapped through an angular Displacement Reflection: Points along a unique intersection of the Domain form an axis about which multiplicative inverses of the remaining Domain points are mapped to a Codomain scaled by their distance from the axis Translation: A linear Displacement Shear: Points constituting one or more axes remain invariant while all other points are subject to a Translation parallel to those axes and proportional to their perpendicular distance from the axes
22.
© Art Traynor
2011 Mathematics Isometry Isometry A Transformation which Maps Elements ( as of a Set ) of one Metric Space to another Metric Space ( or to a Subspace of itself ) such that all Elements ( e.g. points ) of the respective spaces remain equidistant Transformation Motion “progressing through Length” Direct Isometry: Translation Indirect Isometry: Reflection n Orientation Preserving The Mathematical Object so transformed by an Isometry thus possesses the property of Congruence with its Codomain Transform Map Isometry is a test for Congruence The Set of all Congruences for an Object is the Union of all its well- defined Isometries Two Objects are Congruent if they are related by an Isometry Composite Isometry: one or more isometries Mapped in sequence Deformations such as Folding, Cutting, Melting, Bending, Stretching, and Twisting are not considered Isometries A Bijective Map
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© Art Traynor
2011 Mathematics Rotation Rotation A Rotation is a Rigid Body motion which maps the points of a Mathematical Object ( or coordinate system) in an orientation-preserving orthogonal Transformation through an angular Displacement Transformation Rotations is well-defined for all Inner Product (Sub) Spaces Any Composite Isometry ( of period p > 2, i.e. two or more successive sequences of Transformation) is either a Rotation or Reflection Properties:
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© Art Traynor
2011 Mathematics Equality Unit Circle Properties of Triangles x y O U r = 1 2 ③ Any one of the three Rigid Motion Transformations, can be applied to demonstrate Equality ( one triangle can be superimposed on any other ) a Rotation b Translation c Reflection
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© Art Traynor
2011 Mathematics Equality Unit Circle Properties of Triangles x y U r = 1 2 ③ Any one of the three Rigid Motion Transformations, can be applied to demonstrate Equality ( one triangle can be superimposed on any other ) a Rotation b Translation c Reflection 2 O
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© Art Traynor
2011 Mathematics r = 1 Equality Unit Circle Properties of Triangles x y U 2 ③ Any one of the three Rigid Motion Transformations, can be applied to demonstrate Equality ( one triangle can be superimposed on any other ) a Rotation b Translation c Reflection 2 O r = 1
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© Art Traynor
2011 Mathematics 2 r = 1 r = 1 Equality Unit Circle Properties of Triangles x y U 2 ③ Any one of the three Rigid Motion Transformations, can be applied to demonstrate Equality ( one triangle can be superimposed on any other ) a Rotation b Translation c Reflection O r = 1
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© Art Traynor
2011 Mathematics r = 1 r = 1 Equality Unit Circle Properties of Triangles x y U 2 ③ Any one of the three Rigid Motion Transformations, can be applied to demonstrate Equality ( one triangle can be superimposed on any other ) a Rotation b Translation c Reflection 2 O r = 1
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© Art Traynor
2011 Mathematics r = 1 O 2 r = 1 r = 1 Equality Unit Circle Properties of Triangles x y U 2 ③ Any one of the three Rigid Motion Transformations, can be applied to demonstrate Equality ( one triangle can be superimposed on any other ) a Rotation b Translation c Reflection O r = 1
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© Art Traynor
2011 Mathematics O 2 r = 1 r = 1 Equality Unit Circle Properties of Triangles x y U 2 ③ Any one of the three Rigid Motion Transformations, can be applied to demonstrate Equality ( one triangle can be superimposed on any other ) a Rotation b Translation c Reflection O r = 1 2
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© Art Traynor
2011 Mathematics r = 1 r = 1 O 2 r = 1 Equality Unit Circle Properties of Triangles x y U 2 ③ Any one of the three Rigid Motion Transformations, can be applied to demonstrate Equality ( one triangle can be superimposed on any other ) a Rotation b Translation c Reflection O
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© Art Traynor
2011 Mathematics r = 1 r = 1 O 2 r = 1 Equality Unit Circle Properties of Triangles x y U 2 ③ Any one of the three Rigid Motion Transformations, can be applied to demonstrate Equality ( one triangle can be superimposed on any other ) a Rotation b Translation c Reflection O r = 1 2
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© Art Traynor
2011 Mathematics r = 1 Equality Unit Circle Properties of Triangles x y U 2 ③ Any one of the three Rigid Motion Transformations, can be applied to demonstrate Equality ( one triangle can be superimposed on any other ) a Rotation b Translation c Reflection 2 O
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© Art Traynor
2011 Mathematics Equality Unit Circle Properties of Triangles x y U r = 1 2 ③ Any one of the three Rigid Motion Transformations, can be applied to demonstrate Equality ( one triangle can be superimposed on any other ) a Rotation b Translation c Reflection 2 O
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© Art Traynor
2011 Mathematics Equality Unit Circle Properties of Triangles x y O U r = 1 2 ③ Any one of the three Rigid Motion Transformations, can be applied to demonstrate Equality ( one triangle can be superimposed on any other ) a Rotation b Translation c Reflection
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© Art Traynor
2011 Mathematics Reflection Transformation Reflection A Transformation in which one Element ( point ) of the Reflection Set is intersected by an n – 1 Ambient Space axis ( Hyperplane ) with the Reflective Codomain consisting of the multiplicative inverses of each remaining point of the Domain scaled by their distance from the Hyperplane axis Rotations is well-defined for all Inner Product (Sub) Spaces Every Isometry in a plane is the product of at most three Reflections, at most two if the Mathematical Object under Transformation features a fixed point Properties: Chiral: The reflection is a mirror image or can be superimposed upon its preimage via a simple Translation Species: Amphichiral: The reflection image cannot be superimposed upon its preimage via a simple Translation
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© Art Traynor
2011 Mathematics Fixed Point Transformation Fixed Point A Fixed Point is an Element for which a Function will Map the identical element in both Domain and CoDomain Sets Also known as an Invariant Point f(c) = c Examples: y = x { 2 } for f(x) = x2 – 3x + 4 f(x) = x + 1 has no fixed point as x ≠ x +1
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© Art Traynor
2011 Mathematics Hyperplane Inner Product Space ( IPS ) An Inner Product Space is a Vector Space over a Field of Scalars (e.g. R or C ) Structured by an Inner Product These spaces have a well-ordered semantic construction of the form: “ The IPS of conventional multiplication over the field of R ” “ The IPS of the dot product over the field of R ” Transformation
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© Art Traynor
2011 Mathematics Definition Trigonometric Functions – Acute Angles Trigonometric Functions x y O U θ a (adj ) b (opp ) c (hyp ) sin θ = b c opp hyp( ) cos θ = a c adj hyp( ) tan θ = b a opp adj( ) csc θ = c b hyp opp( ) sec θ = c a hyp adj( ) cot θ = a b adj opp( ) Think “A” for Adjacent, and then b=opp simply follows by process of elimination * Sin is the “fundamental” relationship from which all others can “key” * θ is what we’re interested in, and the opposite angle (b) is the most conspicuous * Cos just looks at the “other” side ratio (to the hypotenuse * The primacy of Sin and of the opp angle is echoed in tan where opp is the numerator * tan θ = sin θ cos θ( ) 1 opp/hyp( ) Sine is Prime and that’s why it Rhymes* “A” is ayyyydjacent…* It’s obeeevious that “B” is opposite*
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© Art Traynor
2011 Mathematics Definition Trigonometric Functions – Obtuse (any) Angle Trigonometric Functions x y O U sin θ = b r opp hyp( ) cos θ = a r adj hyp( ) tan θ = b a opp adj( ) csc θ = r b hyp opp( ) sec θ = r a hyp adj( ) cot θ = a b adj opp( )P ( a, b ) Terminal Side θ Initial Sidea (adj ) b (opp ) r (hyp ) Think “A” for Adjacent, and then b=opp simply follows by process of elimination * Sin is the “fundamental” relationship from which all others can “key” * θ is what we’re interested in, and the opposite angle (b) is the most conspicuous * Cos just looks at the “other” side ratio (to the hypotenuse * The primacy of Sin and of the opp angle is echoed in tan where opp is the numerator *
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© Art Traynor
2011 Mathematics Definition Inverse Trigonometric Functions Trigonometric Functions sin θ = b c opp hyp( ) sin-1 θ = arcsin θ x y O θ a (adj ) b (opp ) c (hyp ) Many of the trigonometric functions are not one-to-one, and thus do not have defined inverse functions over their unrestricted domains Injunction or Injective Function (one-to-one) where "a"b ( f(a) = f(b) a = b ) Every x A maps to B only once , and every f(x) B maps to A only once Every f(x) B maps to A only once Inverse trig functions therefore must be defined over appropriately restricted ranges cos θ = a c adj hyp( ) cos-1 θ = arccos θ tan θ = b a opp adj( ) tan-1 θ = arctan θ
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© Art Traynor
2011 Mathematics Definition Inverse Trigonometric Functions Trigonometric Functions sin θ = b c opp hyp( ) sin-1 θ = arcsin θ x y O θ a (adj ) b (opp ) c (hyp ) Many of the trigonometric functions are not one-to-one, and thus do not have defined inverse functions over their unrestricted domains Injunction or Injective Function (one-to-one) where "a"b ( f(a) = f(b) a = b ) Every x A maps to B only once , and every f(x) B maps to A only once Every f(x) B maps to A only once Inverse trig functions therefore must be defined over appropriately restricted domains cos θ = a c adj hyp( ) cos-1 θ = arccos θ tan θ = b a opp adj( ) tan-1 θ = arctan θ sin-1( sin θ ) = θ cos-1( cos θ ) = θ tan-1( tan θ ) = θ (g ○ f)(θ) = θf(θ) f -1(θ) = g(θ)
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© Art Traynor
2011 Mathematics Definition Trigonometric Identities Obtuse (any) Angle Trigonometric Functions x y O U P ( a, b ) Terminal Side θ Initial Sidea (adj ) b (opp ) r (hyp ) csc θ = r b hyp opp( )= 1 sin θ( )= 1 b/r( )= 1 opp/hyp( ) sec θ = r a hyp adj( )= 1 cos θ( )= 1 a/r( )= 1 adj/hyp( ) cot θ = a b adj opp( )= 1 tan θ( )= 1 b/a( )= 1 opp/adj( ) cot θ = a b adj opp( )= cos θ sin θ( )= a/r b/r( )= adj/hyp opp/hyp( ) tan θ = b a opp adj( )= sin θ cos θ( )= b/r a/r( )= opp/hyp adj/hyp( ) sin2 θ + cos2 θ = 1 1 + tan2 θ = sec 2 θ 1 + cot 2 θ = csc 2 θ aka, the Pythagorean Relation of trigonometry These may have to be memorized! Appeared in problem set 1.1 #15 *
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© Art Traynor
2011 Mathematics Rules of Differentiation – Functions (Trigonometric) Where the Differential Operator is denoted as Dx and where Dx f(x) = f´(x) Dx sin x = cos x Dx tan x = sec 2 x Dx cos x = - sin x Dx cot x = - csc 2 x Dx sec x = sec x tan x Dx csc x = - csc x cot x Easy 1 The Dx of tan is what we seec (twice) not coco not coco co Whenever CSC shows up, it’s always a negative experience 2 3 Derivatives of themselves + 4 only squares Differentiation Trigonometric Functions
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© Art Traynor
2011 Mathematics Rules of Differentiation – Functions (Trigonometric) Where the Differential Operator is denoted as Dx and where Dx f(x) = f´(x) Differentiation Trigonometric Functions sin2 θ + cos2 θ = 1 csc2 θ – cot2 θ = 1 sec2 θ – tan2 θ = 1 – 1 sin2 θ = 1sin2 θ cos2 θ – 1 cos2 θ = 1cos2 θ sin2 θ I’m pretty sure the title of this slide is wrong…these appear to be identities and not derivatives *
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© Art Traynor
2011 Mathematics Definition Angular Values – Common Angles Trigonometric Functions x y U Π 6 30 ° :: Π 4 45 ° :: Π 3 60 ° :: Π 2 Twos Sixes Fours Threes 30 ° 45 ° 60 ° 90 ° 120 ° 135 ° 150 ° 180 ° 210 ° 225 ° 240 ° 270 ° 300 ° 315 ° 330 ° 360 ° Π 6 Π 4 Π 3 Π 2 2Π 3 3Π 4 5Π 6 Π 7Π 6 5Π 4 4Π 3 3Π 2 5Π 3 7Π 4 11Π 6 2Π
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© Art Traynor
2011 Mathematics Definition Trig Function Values – Common Angles Trigonometric Functions x y Π 6 30 ° :: Π 4 45 ° :: Π 3 60 ° :: θ θ 1 √¯ 3 2 2 √¯ 2 1 Π 6 30 ° :: 1 2 √¯ 3 2 a b r = c sin θ opp hyp( ) b r cos θ adj hyp( ) a r tan θ opp adj( ) b a cot θ adj opp( ) a b Π 4 45 ° :: 1 Π 3 60 ° :: sin-1θ = csc θ = 1 sin θ( )= 1 opp/hyp( ) √¯ 2 2 √¯ 3 2 cos-1θ = sec θ = 1 cos θ( )= 1 adj/hyp( ) √¯ 2 2 1 2 √¯ 3 3 √¯ 3 cos-1θ = sec θ = 1 cos θ( )= 1 adj/hyp( ) √¯ 3 11 θ © Art Traynor 2011 csc θ 1 opp/hyp( ) csc θ 1 adj/hyp( ) √¯ 3 1 √¯ 3 3 2√¯ 3 3 √¯ 2 2 2 √¯ 2 2√¯ 3 3 1 b/r 1 a/r
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© Art Traynor
2011 Mathematics Definition Trigonometric Functions – Acute Angles Trigonometric Functions x y O U θ a (adj ) b (opp ) r = c (hyp ) M A (1, 0) P ( cos θ, sin θ ) 1 sin θ cos θ lim sin θ = 0 θ→0 b r opp hyp( )= b 1 = lim cos θ = 1 θ→0 a r adj hyp( )= a 1 =
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© Art Traynor
2011 Mathematics Differentiation Derivatives of the Trigonometric Functions Where the Differential Operator is denoted as D and where D f(x) = f (x), and where Trigonometric Functions x x ´ x denotes a real number of the radian measure of an angle Dx sin x = cos x Dx tan x = sec2 x Dx cos x = - sin x Dx cot x = - csc 2 x Dx sec x = sec x tan x Dx csc x = - csc x cot x These may have to be memorized! Appeared in problem set 1.1 #15 *
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© Art Traynor
2011 Mathematics Differentiation Derivatives of the Trigonometric Functions Where the Differential Operator is denoted as D and where D f(x) = f (x), and where Trigonometric Functions x x ´ x denotes a real number of the radian measure of an angle Dx sin x = cos x Dx tan x = sec2 x Dx cos x = - sin x Dx cot x = - csc 2 x Dx sec x = sec x tan x Dx csc x = - csc x cot x These may have to be memorized! Appeared in problem set 1.1 #15 *
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© Art Traynor
2011 Mathematics Definition Trigonometric Functions – Acute Angles Trigonometric Functions x y O U θ a (adj ) b (opp ) r = c (hyp ) M A (1, 0) P ( cos θ, sin θ ) 1 tan θ cos θ Q sin θ Area of a Triangle: Given triangle ∆ ABC (three-sided polygon, composed of three line segments and three opposing vertices) of height “ h”, the area is given by n A = ½bh h b ac A B C Area of a Circular Arc (Sector): Where θ is the measure of a central angle of a circle of radius r , then the area A of the circular sector determined by θ is given by n A = ½r 2 θ θ r r Sandwich Theorem Application/Proof s
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© Art Traynor
2011 Mathematics Definition Trigonometric Functions – Acute Angles Trigonometric Functions x y O U θ a (adj ) b (opp ) r = c (hyp ) M A (1, 0) P ( cos θ, sin θ ) 1 tan θ cos θ Q sin θ Area of a Triangle: A = ½bh h b ac A B C Area of a Circular Arc (Sector): A = ½r 2 θ θ r r MP = sin θ AQ = tan θ ∆ AOP Area of < Sector AOP Area of < ∆ AOQ Area of ½(1)MP ½bh < < ½(1)sinθ ½(1) 2 θ ½r 2 θ ½(1)MQ ½bh ½(1)tanθ < <½ sinθ ½θ ½ tanθ Sandwich Theorem Application/Proof s
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