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Algebra 3 Assignment Sheet
WELCOME TO TRIGONOMETRY, ENJOY YOUR STAY
(1) Assignment # 1 Complete the circle diagram
(2) Assignment # 2 Sine & Cosine functions chart
(3) Assignment # 3 Other Trig functions chart
(4) Assignment # 4 Finding other trig functions
(5) Assignment # 5 Review Worksheet
(6) TEST
(7) Assignment # 6 Angle Addition Formulas
(8) Assignment # 7 Double, Half-Angle Formulas
(9) Assignment # 8 Review Worksheet
(10) TEST
(11) Assignment # 9 Trig Identities (1)
(11) Assignment # 9 Trig Identities (2)
(12) Assignment # 10 Problems ( 1 – 9 ) Solving Trig Equations
(13) Assignment # 10 Problems ( 10 – 18 ) Solving Trig Equations
(14) Assignment # 11 Review Worksheet – Solving Trig Equations
(15) TEST
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INTRODUCTION TO TRIGONOMETRY
I Definition of radian: Radians are an angular measurement. One radian is the measure of a central angle of a circle that is subtended by an arc whose length is equal to the radius of the circle.
Therefore: arc length = angle in radians x radius
The radius wraps itself around the circle times. Approx. 6.28 times.Therefore = Dividing you get ………..
Conversely ………………………...
Ex. Change to radians.
Change to degrees.
Convert the following from degrees to radians or vice versa:1. 2. 3. 195
0 ,R2
2
32
1 R55 2 R5
10
1
2
3
6
4
5
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4. 5. 6.
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II UNIT CIRCLE:
The unit circle is the circle with radius = 1, center is located at the origin.
What is the equation of this circle?
Important Terms:A. Initial side:
B. Terminal side:
C. Coterminal angles:
D. Reference angles:
The initial and terminal sides form an angle at the center
if the terminal side rotates CCW, the angle is positiveif the terminal side rotates CW, the angle is negative
unit circle positive negative coterminal
Coterminal angles have the same terminal side…. -45˚ and 315˚ or and
The reference angle is the acute angle made between the Terminal Side and the x-axis
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III GEOMETRY REVIEW
30 – 60 – 90 RIGHT TRIANGLES 45 – 45 - 90
Therefore, for the Unit Circle, hypotenuse is always 1.
60
30
a2a
3a
60
30
1/21
3 / 2
45
45
a
a
a
45
45
2 / 2
2 / 2
1
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Algebra 3 Assignment # 1
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Trigonometric Functions
Let θ “theta” represent the measure of the reference angle.
Three basic functions are sine, cosine and tangent.
They are written as sin θ, cos θ, and tan θ
Right triangle trigonometry - SOHCAHTOA
A. Find cos θ B. Find sin θ
C. Find tan θ D. Find sin θ
θ
hyp
adj
opp
12θ
5
13
θ
5
5
5
θ
69
θ
725
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Triangles in the Unit Circle
On the Unit Circle:I
Where functions are positive
II Reference Triangles
A. Drop from point to x-axis.
1
O
P(x,y)
A (1,0)
B (0,1)
x
y
O
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B. Examples1. Find sin
2. Find cos Same as cos
3. Find sin =
4. Find cos =
5. Find sin = cos =
coterminal angles
coterminal angles
coterminal angles
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III Quadrangle Angles
Def: An angle that has its terminal side on one of the coordinate axes.
To find these angles , use the chart
Find the sine, cosine for all the quadrangles.
Trig values
A (1,0)
B (0,1)
C (-1,0)
D (0,-1)
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Algebra 3 Assignment # 2
Complete each of the following tables please.
Radian Measure
Degree Measure
Sin
Cos
Radian Measure
Degree Measure
Sin
Cos
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Answers
Radian Measure
Degree Measure
Sin 1 0
Cos 0 1
Radian Measure
Degree Measure
Sin 1 0 1
Cos 0 1 0
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6.2 Other Trigonometric Functions
Sin Cosecant:
Cos Secant:
Tan Cotangent:
http://mathplotter.lawrenceville.org/mathplotter/mathPage/trig.htm
Find the following values1. 2. 3. 4.
5. 6. 7. 8.
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6.2 Algebra 3 Assignment # 3
Complete the following tables.
Radian MeasureDegree
Measure 330 450 135 240
Sin
Cos
Tan
Cot
Sec
Csc
Radian MeasureDegree
Measure 540 150 210 270
Sin
Cos
Tan
Cot
Sec
Csc
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Alg 3(11) 17Ch 6 Trig
Answers
Radian MeasureDegree
Measure 480 330 135 450 30 135 900 240
Sin 1 0
Cos 0 1
Tan 1 Undef. 1 0
Cot 1 0 1 Undef.
Sec 2 Undef. 1 2
Csc 2 1 2 Undef.
Radian MeasureDegree
Measure 270 540 420 150 585 210 315 270
Sin 1 0 1
Cos 0 1 0
Tan Undef. 0 1 1 Undef.
Cot 0 Undef. 1 1 0
Sec Undef. 1 2 Undef.
Csc 1 Undef. 2 2 1
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Alg 3(11) 18Ch 6 Trig
6.2 MORE TRIG FUNCTIONS
Identifying in which quadrant the angle lies is
essential for having the correct signs of the trig functions.
If given, Sin θ = and if told that , can we find the cos θ?
1. Find cos if sin = 2/3 and 2. Find tan if sin = 3/7 and
θ1θ
θ
x
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Alg 3(11) 19Ch 6 Trig
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Alg 3(11) 20Ch 6 Trig
3. Find csc if cos = and 4. Find sec if sin = -1/3 and
5. If Tan = , , find all the remaining functions of .
6. Find the values of the six trig. functions of , if is an angle in standard position with the point (-5, -12) on its terminal ray.
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Alg 3(11) 21Ch 6 Trig
Algebra 3 Assignment # 4
(1) Sin( ) = , . Find the remaining 5 trig. functions of .
(2) Cos( ) = , . Find the remaining 5 trig. functions of .
(3) Tan( ) = , . Find the remaining 5 trig. functions of .
(4) Sec( ) = , . Find the remaining 5 trig. functions of .
(5) Csc( ) = , . Find the remaining 5 trig. functions of .
(6) Cot( ) = , . Find the remaining 5 trig. functions of .
(7) Sin( ) = , . Find the remaining 5 trig. functions of .
(8) Find the values of the six trig. functions of , if is an angle in standard position with the point (4 , 3) on its terminal ray
(9) Find the values of the six trig. functions of , if is an angle in standard position with the point (5 , 12) on its terminal ray
Trig Assignment #4 Answers
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Alg 3(11) 22Ch 6 Trig(1) cos( ) = , tan( ) = , cot( ) = , sec( ) = , csc( ) =
(2) sin( ) = , tan( ) = , cot( ) = , sec( ) = , csc( ) =
(3) sin( ) = , cos( ) = , cot( ) = , sec( ) = , csc( ) =
(4) sin( ) = , cos( ) = , tan( ) = , cot( ) = , csc( ) =
(5) sin( ) = , cos( ) = , tan( ) = , cot( ) = , sec( ) =
(6) sin( ) = , cos( ) = , tan( ) = , sec( ) = , csc( ) =
(7) cos( ) = , tan( ) = , cot( ) = , sec( ) = , csc( ) =
(8) sin( ) = cos( ) = , tan( ) = , cot( ) = , sec( ) = , csc( ) =
(9)sin( ) = cos( ) = , tan( ) = , cot( ) = , sec( ) = , csc( ) =
Algebra 3 Review Worksheet
(1) Complete the following table please.
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Alg 3(11) 23Ch 6 Trig
Rad.
Deg. 135 330 150 750 240
sin
cos
tan
cot
sec
csc
(2) Sin(x) = , . Find the remaining 5 trig functions of x.
(3) Tan() = , . Find the remaining 5 trig functions of .
(4) Cot(x) = 0.8 , . Find the remaining 5 trig functions of x.
(5) Sec() = 3 , . Find the remaining 5 trig functions of .
(6) Find the values of the six trig. functions of , if is an angle in standard position with the point (5 , 3) on its terminal ray.
Algebra 3 Review Answers(1)
Rad.
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Alg 3(11) 24Ch 6 Trig
Deg. 120 135 270 330 540 150 600 750 405 240 45
sin 1 0
cos 0 1
tan 1 Undef 0 - 1 1
cot 1 0 Undef 1 1
sec 2 Undef 1 2 2
csc 1 2 Undef 2 2
(2) cos(x) = , tan(x) = , cot(x) = , sec(x) = , csc(x) =
(3) sin() = , cos() = , cot() = 2 , sec() = , csc() =
(4) sin(x) = , cos(x) = , tan(x) = , sec(x) = , csc(x) =
(5) sin() = , cos() = , tan() = , cot() = , csc() =
(6) sin() = , cos() = , tan() = , cot() = , sec() = , csc() =
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Alg 3(11) 25Ch 6 Trig
ADDITION AND SUBTRACTION FORMULAS
sin = sin cos + cos sinsin = sin cos - cos sincos = cos cos - sin sincos = cos cos + sin sin
tan =
tan =
SPECIAL ANGLES
2 nd 3 rd 4 th
120 ___ ___
135 ___ ___
150 ___ ___
180 ___ ___
COMBINATIONS
15 = 345 =
255 = =
0 ,R2
2
32
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Alg 3(11) 26Ch 6 TrigEXAMPLES
Evaluate each expression
1) sin 75
sin (45 + 30) sin(120 – 45)
2) cos 345
3) tan
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Alg 3(11) 27Ch 6 Trig
Simplify the following:
4) cos (270 - x)
5) sin ( x + ) =
6) cos ( )
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Alg 3(11) 28Ch 6 TrigFind each of the following numbers:
If sin A = , 0 < A < and cos B = ,
7) sin (A + B)
8) cos (A – B)
9) tan (A + B )
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Alg 3(11) 29Ch 6 Trig
Algebra 3 Trig Formulas Assignment #6
(1) Find each of the following numbers please.
(a) sin(15 ) (b) cos(15 )
(c) sin(105 ) (d) cos(75 )
(e) sin (f) cos
(g) sin(345 ) (h) tan(15 )
(2) Simplify each of the following please.
(a) sin(90 + x) (b) cos( x)
(c) sin(180 x) (d) cos( + x)
(3) Sin(A) = , A is in Quadrant I, Cos(B) = , B is in Quadrant II. Find each of the following numbers please.
(a) sin(A + B) (b) cos(A + B)
(c) sin(A B) (d) cos(A B)
(e) tan(A + B) (f) csc(A B)
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Alg 3(11) 30Ch 6 Trig
Assignment #6
Answers
(1) (a) (b)
(c) (d)
(e) (f)
(g) (h)
(2) (a) cos (b) sin
(c) sin (d) cos
(3) (a) (b)
(c) (d)
(e) (f)
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Alg 3(11) 31Ch 6 Trig
DOUBLE AND HALF ANGLE FORMULAS
Double – Angle Formulas Half – Angle Formulas
Find each of the following numbers, please.
1) sin ( )
2) cos ( )
C
AS
T
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Alg 3(11) 32Ch 6 Trig
If Sin A = , Tan B =
Find the following numbers, please.
3) sin ( A)
4) cos (2B)
5) sin (A + B)
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Alg 3(11) 33Ch 6 TrigAlgebra 3 Double and Half Angle Formulas Assignment #7
(1) Find each of the following numbers please.
(a) sin(67 ) (b) cos
(c) sin (d) cos(202 )
(2) Sin(A) = , , Tan(B) = , . Find each of the following numbers please.
(a) sin( A) (b) cos( A)
(c) sin( B) (d) sec( B)
(e) sin(2B) (f) cos(2A)
(g) csc(A B) (h) cos(A + B)
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Alg 3(11) 34Ch 6 Trig
Answers
(1) (a) (b)
(c) (d)
(2) (a) (b)
(c) (d)
(e) (f)
(g) (h)
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Alg 3(11) 35Ch 6 Trig
Algebra 3 Formula Review Worksheet, Assignment #8
(1) Find each of the following numbers please.
(a) sin(15 ) (b) cos(105 )
(c) sin(195 ) (d) cos(285 )
(e) sin(112 ) (f) cos
(g) tan(75) (h) sec
(2) Simplify each of the following please.
(a) sin(180 + x) (b) cos( + x)
(c) sin( x) (d) cos(180 x)
(3) Sin(A) = , , Sec(B) = , . Find each of the following numbers.
(a) sin(A + B) (b) cos(A + B)
(c) sin(A B) (d) cos(A B)
(e) sin(2B) (f) cos(2A)
(g) sin (h) cos
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Alg 3(11) 36Ch 6 Trig
Answers
(1) (a) or (b) or
(c) or (d) or
(e) (f)
(g) (h)
(2) (a) sin (b) sin
(c) cos (d) cos
(3) (a) (b)
(c) (d)
(e) (f)
(g) (h)