2sinα^2cosα-sin(3/2π-α)cos2α
=2sinα^2cosα+cosαcos2α
= cosα*(2sinα^2+cos2α)
= cosα*(2sinα^2+(1-2sinα^2))
= cosα*1
= cosα.
化简:2sinα^2cosα-sin(3/2π-α)cos2α=
化简:2sinα^2cosα-sin(3/2π-α)cos2α=
数学人气:175 ℃时间:2020-04-16 20:11:38
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