Question

How do you find `sin theta` if `cos theta = 3/5` and theta terminates in Q 1?

Answer 1

cos x = 3/5 --> sin x = 4/5

Explanation:

`sin^2 x = 1 - cos^2 x = 1 - 9/25 = 16/25` ->

--> `sin x = +- 4/5.`

Since x is in Quadrant I, the answer 4/5 is chosen.