Question

решите выражение
Заранее спасибо​

Answer 1

$\frac{Sin4\alpha}{1+Cos4\alpha}*\frac{Cos2\alpha}{1+Cos2\alpha } =\frac{2Sin2\alpha Cos2\alpha}{2Cos^{2}2\alpha}*\frac{Cos2\alpha}{2Cos^{2}\alpha} =\frac{Sin2\alpha}{Cos^{2}\alpha}=\frac{2Sin\alpha Cos\alpha}{Cos^{2}\alpha}=\frac{2Sin\alpha }{Cos\alpha}=2tg\alpha$