<< Chapter < Page Chapter >> Page >

Numeric

For the following exercises, state the reference angle for the given angle.

For the following exercises, find the reference angle, the quadrant of the terminal side, and the sine and cosine of each angle. If the angle is not one of the angles on the unit circle, use a calculator and round to three decimal places.

300°

60° , Quadrant IV, sin ( 300° ) = 3 2 , cos ( 300° ) = 1 2

Got questions? Get instant answers now!

135°

45° , Quadrant II, sin ( 135° ) = 2 2 , cos ( 135° ) = 2 2

Got questions? Get instant answers now!

120°

60° ,   Quadrant II, sin ( 120° ) = 3 2 , cos ( 120° ) = 1 2

Got questions? Get instant answers now!

150°

30° , Quadrant II, sin ( 150° ) = 1 2 , cos ( 150° ) = 3 2

Got questions? Get instant answers now!

7 π 6

π 6 , Quadrant III, sin ( 7 π 6 ) = 1 2 , cos ( 7 π 6 ) = 3 2

Got questions? Get instant answers now!

3 π 4

π 4 , Quadrant II, sin ( 3 π 4 ) = 2 2 , cos ( 4 π 3 ) = 2 2

Got questions? Get instant answers now!

2 π 3

π 3 , Quadrant II, sin ( 2 π 3 ) = 3 2 , cos ( 2 π 3 ) = 1 2

Got questions? Get instant answers now!

7 π 4

π 4 , Quadrant IV, sin ( 7 π 4 ) = 2 2 , cos ( 7 π 4 ) = 2 2

Got questions? Get instant answers now!

For the following exercises, find the requested value.

If cos ( t ) = 1 7 and t is in the fourth quadrant, find sin ( t ) .

Got questions? Get instant answers now!

If cos ( t ) = 2 9 and t is in the first quadrant, find sin ( t ) .

77 9

Got questions? Get instant answers now!

If sin ( t ) = 3 8 and t is in the second quadrant, find cos ( t ) .

Got questions? Get instant answers now!

If sin ( t ) = 1 4 and t is in the third quadrant, find cos ( t ) .

15 4

Got questions? Get instant answers now!

Find the coordinates of the point on a circle with radius 15 corresponding to an angle of 220° .

Got questions? Get instant answers now!

Find the coordinates of the point on a circle with radius 20 corresponding to an angle of 120° .

( −10 ,   10 3 )

Got questions? Get instant answers now!

Find the coordinates of the point on a circle with radius 8 corresponding to an angle of 7 π 4 .

Got questions? Get instant answers now!

Find the coordinates of the point on a circle with radius 16 corresponding to an angle of 5 π 9 .

( –2.778 ,   15.757 )

Got questions? Get instant answers now!

State the domain of the sine and cosine functions.

Got questions? Get instant answers now!

State the range of the sine and cosine functions.

[ –1 ,   1 ]

Got questions? Get instant answers now!

Graphical

For the following exercises, use the given point on the unit circle to find the value of the sine and cosine of t .

Graph of circle with angle of t inscribed. Point of (negative square root of 3 over 2, 1/2) is at intersection of terminal side of angle and edge of circle.

sin t = 1 2 , cos t = 3 2

Got questions? Get instant answers now!
Graph of circle with angle of t inscribed. Point of (negative square root of 2 over 2, negative square root of 2 over 2) is at intersection of terminal side of angle and edge of circle.

sin t = 2 2 , cos t = 2 2

Got questions? Get instant answers now!
Graph of circle with angle of t inscribed. Point of (-1/2, square root of 3 over 2) is at intersection of terminal side of angle and edge of circle.

sin t = 3 2 , cos t = 1 2

Got questions? Get instant answers now!
Graph of circle with angle of t inscribed. Point of (square root of 2 over 2, negative square root of 2 over 2) is at intersection of terminal side of angle and edge of circle.

sin t = 2 2 , cos t = 2 2

Got questions? Get instant answers now!
Graph of circle with angle of t inscribed. Point of (-1,0) is at intersection of terminal side of angle and edge of circle.

sin t = 0 ,   cos t = 1

Got questions? Get instant answers now!
Graph of circle with angle of t inscribed. Point of (0.803,-0.596 is at intersection of terminal side of angle and edge of circle.

sin t = 0.596 ,   cos t = 0.803

Got questions? Get instant answers now!
Graph of circle with angle of t inscribed. Point of (square root of 3 over 2, 1/2) is at intersection of terminal side of angle and edge of circle.

sin t = 1 2 , cos t = 3 2

Got questions? Get instant answers now!
Graph of circle with angle of t inscribed. Point of (square root of 3 over 2, -1/2) is at intersection of terminal side of angle and edge of circle.

sin t = 1 2 , cos t = 3 2

Got questions? Get instant answers now!
Graph of circle with angle of t inscribed. Point of (-0.649, 0.761) is at intersection of terminal side of angle and edge of circle.

sin t = 0.761 , cos t = 0.649

Got questions? Get instant answers now!

Technology

For the following exercises, use a graphing calculator to evaluate.

cos 5 π 9

−0.1736

Got questions? Get instant answers now!

cos 3 π 4

−0.7071

Got questions? Get instant answers now!

Extensions

For the following exercises, evaluate.

sin ( 11 π 3 ) cos ( 5 π 6 )

Got questions? Get instant answers now!

sin ( 3 π 4 ) cos ( 5 π 3 )

2 4

Got questions? Get instant answers now!

sin ( 4 π 3 ) cos ( π 2 )

Got questions? Get instant answers now!

sin ( 9 π 4 ) cos ( π 6 )

6 4

Got questions? Get instant answers now!

sin ( π 6 ) cos ( π 3 )

Got questions? Get instant answers now!

sin ( 7 π 4 ) cos ( 2 π 3 )

2 4

Got questions? Get instant answers now!

cos ( 5 π 6 ) cos ( 2 π 3 )

Got questions? Get instant answers now!

cos ( π 3 ) cos ( π 4 )

2 4

Got questions? Get instant answers now!

sin ( 5 π 4 ) sin ( 11 π 6 )

Got questions? Get instant answers now!

sin ( π ) sin ( π 6 )

0

Got questions? Get instant answers now!

Real-world applications

For the following exercises, use this scenario: A child enters a carousel that takes one minute to revolve once around. The child enters at the point ( 0 , 1 ) , that is, on the due north position. Assume the carousel revolves counter clockwise.

What are the coordinates of the child after 45 seconds?

Got questions? Get instant answers now!

What are the coordinates of the child after 90 seconds?

( 0 , –1 )

Got questions? Get instant answers now!

What are the coordinates of the child after 125 seconds?

Got questions? Get instant answers now!

When will the child have coordinates ( 0.707 , –0.707 ) if the ride lasts 6 minutes? (There are multiple answers.)

37.5 seconds, 97.5 seconds, 157.5 seconds, 217.5 seconds, 277.5 seconds, 337.5 seconds

Got questions? Get instant answers now!

When will the child have coordinates ( –0.866 , –0.5 ) if the ride lasts 6 minutes?

Got questions? Get instant answers now!

Questions & Answers

Why is b in the answer
Dahsolar Reply
how do you work it out?
Brad Reply
answer
Ernest
heheheehe
Nitin
(Pcos∅+qsin∅)/(pcos∅-psin∅)
John Reply
how to do that?
Rosemary Reply
what is it about?
Amoah
how to answer the activity
Chabelita Reply
how to solve the activity
Chabelita
solve for X,,4^X-6(2^)-16=0
Alieu Reply
x4xminus 2
Lominate
sobhan Singh jina uniwarcity tignomatry ka long answers tile questions
harish Reply
t he silly nut company makes two mixtures of nuts: mixture a and mixture b. a pound of mixture a contains 12 oz of peanuts, 3 oz of almonds and 1 oz of cashews and sells for $4. a pound of mixture b contains 12 oz of peanuts, 2 oz of almonds and 2 oz of cashews and sells for $5. the company has 1080
ZAHRO Reply
If  , , are the roots of the equation 3 2 0, x px qx r     Find the value of 1  .
Swetha Reply
Parts of a pole were painted red, blue and yellow. 3/5 of the pole was red and 7/8 was painted blue. What part was painted yellow?
Patrick Reply
Parts of the pole was painted red, blue and yellow. 3 /5 of the pole was red and 7 /8 was painted blue. What part was painted yellow?
Patrick
how I can simplify algebraic expressions
Katleho Reply
Lairene and Mae are joking that their combined ages equal Sam’s age. If Lairene is twice Mae’s age and Sam is 69 yrs old, what are Lairene’s and Mae’s ages?
Mary Reply
23yrs
Yeboah
lairenea's age is 23yrs
ACKA
hy
Katleho
Ello everyone
Katleho
Laurene is 46 yrs and Mae is 23 is
Solomon
hey people
christopher
age does not matter
christopher
solve for X, 4^x-6(2*)-16=0
Alieu
prove`x^3-3x-2cosA=0 (-π<A<=π
Mayank Reply
create a lesson plan about this lesson
Rose Reply
Excusme but what are you wrot?
Practice Key Terms 3

Get Jobilize Job Search Mobile App in your pocket Now!

Get it on Google Play Download on the App Store Now




Source:  OpenStax, Algebra and trigonometry. OpenStax CNX. Nov 14, 2016 Download for free at https://legacy.cnx.org/content/col11758/1.6
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Algebra and trigonometry' conversation and receive update notifications?

Ask