Question

Срочноо! ДАЮ 15 БАЛОВ! ПОМОГИТЕ ПОЖАЛУСТА!​

Answer 1

$(\frac{Cos\alpha}{Sin2\alpha}+\frac{Sin\alpha}{Cos2\alpha})*\frac{Sin4\alpha}{Cos\alpha}=\frac{Cos\alpha Cos2\alpha+Sin\alpha Sin2\alpha}{Sin2\alpha Cos2\alpha}*\frac{Sin4\alpha}{Cos\alpha}=\frac{Cos(\alpha-2\alpha)}{Sin2\alpha Cos2\alpha}*\frac{Sin4\alpha}{Cos\alpha}=\frac{Cos\alpha}{Sin2\alpha Cos2\alpha}*\frac{2Sin2\alpha Cos2\alpha}{Cos\alpha}=2$