Question$2 \cos ^{2} x-2 \sin ^{2} x=1$

Studdy Solution
The solutions to the equation $2 \cos ^{2} x-2 \sin ^{2} x=1$ are $x = \frac{\pi}{6} + n\pi$ and $x = \frac{5\pi}{6} + n\pi$, where $n$ is any integer.