Find cos θ if sin θ = 35.

Question

Find cos θ if sin θ = 35.



A.  

B.

C.

D

Answer 1

As Paul M. pointed out in the comments, the sine function ranges between -1 and 1, so it cannot equal 35. Mark M. then commented that maybe you meant 3/5, and I'm thinking he's right. Whatever the value of sin θ, you can find cos θ using the Pythagorean Identity:

sin²θ + cos²θ = 1

Just plug in the value of sin θ and then solve for cos θ.