Question

231 задание помогите!!!!

Answer 1

$1)frac{Sin^{2}2alpha}{Sin(alpha+frac{3pi }{2})*Cos(frac{pi }{2}-alpha)}=frac{Sin^{2}2alpha}{-Cosalpha*Sinalpha}=-frac{4Sin^{2}alpha Cos^{2}alpha}{Cosalpha Sinalpha}=-4Sinalpha Cosalpha$

$2)Sinalpha +Cosalpha=sqrt{2}\\(Sinalpha+Cosalpha)^{2}=(sqrt{2})^{2} \\Sin^{2}alpha+2Sinalpha Cosalpha +Cos^{2}alpha=2\\1+2Sinalpha Cosalpha=2\\2Sinalpha Cosalpha=1\\3)-4Sinalpha Cosalpha=2Sinalpha Cosalpha*(-2)=1*(-2)=-2$

Ответ : - 2