The Attempt at a Solution
I'm not sure how to take 1/2 the arcsin, should this use the half-angle formula?
Normally I would draw a triangle using the sin value (-7/25), then find the tan value (24/25), but the 1/2 is throwing me off.
How do I start this? Is this 1/2 the sin value (-7/25)= -7/50, then solve for the tan(-7/50)?