Question

Find cos(θ) if sin(θ) is given and θ terminates in QIII.

Answer 1

sin (theta) = -((sqrt15)/8)

Answer 2

Are you allowed to use the arcsine function?
You could take the arcsine and find the theta and then simply do cos (theta).

Answer 3

I figured it out!!
Thanks anyway, man (or woman)! Haha!

Answer 4

I realized that 8 would be the bottom number, so I used the Pythagorean Theorem. :)