Question

Упростить 1+tg^2(П/4-x/2)

Answer 1

$Tozdestvo:\; \; 1+tg^2 \alpha =\frac{1}{cos^2 \alpha }\\\\\\1+tg^2(\frac{\pi}{4}-\frac{x}{2})=\frac{1}{cos^2(\frac{\pi}{4}-\frac{x}{2})}$