Simplify the trigonometric expression
For this math problem, I attempted to multiply $\cos^2 x$ and $\tan^2(-x)$ so it becomes $-\sin^2 (x) - 1$, but I am still stuck on how to simplify this problem.
Edit: Thanks to the commenter for helping me solve, but I just have one more question. Would the solution for this be -1? The numerator simplified to sin^2 x - 1, which is equivalent as -cos^2 x from the pythagorean identity. I'm just curious if -1 is the solution.