Question

Please help!
Find cos x if sin^2 x-1/ cos x =-1

Answer 1

This will help you:

https://www.wolframalpha.com/input/?i=sin^2+x-1%2F+cos+x+%3D-1

Answer 2

\(\large\color{black}{ \sin^2 x-1=-\cos^2x }\)

Answer 3

another thing: -cos^2x / cosx = -cosx

Answer 4

Is that it or do I solve it?