Question

1 + cot^2(-θ)?

sin^2(-θ) + cos^2(-θ) ?

Answer 1

Do you know that
\[\sin^2(x) + \cos^2(x) = 1\]
?

Answer 2

yes, but sin^2(-θ) + cos^2(-θ) = -sin^2 + cos^2
so how do i figure that out?