Question

решите выражение
Заранее спасибо​

Answer 1

$frac{Sin4alpha}{1+Cos4alpha}*frac{Cos2alpha}{1+Cos2alpha } =frac{2Sin2alpha Cos2alpha}{2Cos^{2}2alpha}*frac{Cos2alpha}{2Cos^{2}alpha} =frac{Sin2alpha}{Cos^{2}alpha}=frac{2Sinalpha Cosalpha}{Cos^{2}alpha}=frac{2Sinalpha }{Cosalpha}=2tgalpha$