Under what conditions will acosθ = b have solutions? Please help...

I think this question is so vague! lol

What does my teacher want from this? We're learnign how to solve trignometric equations.. but I just don't get what I"m supposed to say to this.

Thank you!

best answer
<3

This happens where cos(θ) = (b/a) which happens where

θ = arccos(b/a)

Thus θ must be in the interval [0,180] in degrees or [0,π] in radians.
Note: The arccos is restricted to [0,180] or [0,π]

.