Question

Помогите пожалуйста с подробным решением

Answer 1

10)  sin^2(α)*cos^2(α)+sin^4(α)=sin^2(α)*(cos^2(α)+sin^2(α))=sin^2(α)*1=sin^2(α)

12)  (1-2cos^2(α))/(sin^2(α)-cos^2(α))=-cos2α/(sinα-cosα)=-(cos^2(α)-sin^2(α))/(sinα-cosα)=-(cosα-sinα)(cosα+sinα)/(sinα-cosα)=cosα+sinα