1.)The angle θ lies in Quadrant IV. sinθ=−2/3 What is cosθ? a. −2/3
b. 2/3
c. −5/√3
d.5/√3

2.)The angle θ lies in Quadrant I. cosθ=3/5 What is tanθ?

a.4/3
b.−4/5
c. −4/3
d. 4/5

3.)Given sin(−θ)=−1/6 and tanθ=−35/√35. What is the value of cosθ?

a.−35/√210
b.−35/√6
c.35/√210
d.35/√6

4.)cos(−θ)=3/√4, sinθ<0 What is the value of sinθ?

a.13/√4
b. 13/√16
c. −13/√16
d.−13/√4

5.)Marty is proving that the following trigonometric identity is true: tan^2 θ⋅cos^2 θ=1−cos^2 θ

Which step would be the first line of his proof?

a. tan^2 θ⋅cos^2 θ=tan^2 θ
b. tan^2 θ⋅cos^2 θ=sin^2 θ
c. tan^2 θ⋅cos^2 θ=1−sin^2 θ
d. tan^2 θ=1−cos^2 θ⋅cos^2 θ

1. From sin²θ +cos²θ =1 and sinθ=-2/3, we see that cosθ=√(1-sin²θ) or cosθ=√5/3, where the sign of cosine is positive as it is in Quadrant IV. x lies in 4th quadrant , cos x is +ve. , cos x = √5/3. Answer.

answer : cos x = √5/3

2.  4/3

3.  sin (- theta)  = - sin (x)        so sin x = 1/6

 tan = sin / cos   =  1/6  /  cos  =  - sqrt35/35     solve for cos

                        cos =  1/6 * (-35/sqrt35)

                                  = -35 sqrt35 /210

answer : −35/√210

4. The cosine function is an even function, so cos(θ) = cos(-θ).

The relationship between sin(θ) and cos(θ) is sin(θ) = ±√(1 -cos(θ)^2)

For sin(θ) < 0 and cos(θ) = (√3)/4,  sin(θ) = -√(1 -3/16) = -√(13/16)

sin(θ) = -(√13)/4   For sin(θ) < 0 and cos(0) = √(3/4), ...

sin(θ) = -√(1 -3/4) = -√(1/4)       sin(θ) = -1/2

answer : -13/√4

5.  answer : tan^2 θ ⋅ cos^2 θ = 1 − cos^2 θ would be the first step

question 1 is 8, question 2 is 9, question 3 is 24

step-by-step explanation:

now, the numbers they give you at the top are the key. from there, you just have to plug and chug! let's try 1, 2, and 3!

key: a=3, b=5, c=6

1. a+5

remember, a=3, so we plug that in to get 3+5=8

2. 15-c

c=6, so we plug that in to get 15-6=9

3. 4b

b=6, so we plug it in to get 4*6=24

time to try the rest on your own! if you put the answers below in a comment, i'll check them for you!

answer: y=4000x+14000

step-by-step explanation: