Question

Доказать триг????????? ​

Answer 1

Воспользовавшись формулой приведения, получаем: $\cos(\cos\alpha)>0,\; \cos\alpha\in[-1;1]$; При этом $[-1;1]\in[-\frac{\pi}{2};\frac{\pi}{2}]$, то есть данное выражение действительно положительно

Answer 2

I apologize, but it seems like your question is incomplete. It looks like you want to prove a trigonometric identity or solve a trigonometric problem, but you haven't provided the specific trigonometric expression or equation you want to work on.

If you could please provide the full trigonometric expression, equation, or problem you want to prove or solve, I'd be more than happy to assist you in showing the steps and solving it. Be as specific as possible, and I'll do my best to help you with your trigonometry question!