Question

the expression

Answer 1

\[\cos ^2 \theta -2\] is equivalent to

Answer 2

\[1-\sin^2\theta-2=-1-\sin^2\theta\]

Answer 3

What are your options?

Answer 4

And I'd suggest that you draw them out because it'd take more time to use the equation helper for people not familiarized with them like you (no offense)