We have: .
. . . . . . . . . . .
So, the above is the equation that I have to verify.
I think the first step to this equation is
-1 (-(1))/(-1(sec2θ)=-cos2θ <-- So... I hope you can kinda get my train of thought here, but I feel like it's completely wrong ()
1/(-1(sec2θ) = -cos2θ
Then by simplifying the above you get -cos2θ ~ however... the blackboard answer I get to select from... doesn't even have an answer close to what I did above...