化简:2sinα^2cosα-sin(3/2π-α)cos2α=
问题描述:
化简:2sinα^2cosα-sin(3/2π-α)cos2α=
答
2sinα^2cosα-sin(3/2π-α)cos2α
=2sinα^2cosα+cosαcos2α
= cosα*(2sinα^2+cos2α)
= cosα*(2sinα^2+(1-2sinα^2))
= cosα*1
= cosα.