求化简:(2sinα^2+sin2α)/(1+tanα)

问题描述:

求化简:(2sinα^2+sin2α)/(1+tanα)

(2sinα^2+sin2α)/(1+tanα)
=(2sinα^2+2sinαcosα)cosα/(sinα+cosα)
=2sinα(sinα+cosα)cosα/(sinα+cosα)
=2sinαcosα
=sin2α