化简sin2(α+π/4)-sin2(π/4-α)如题
问题描述：
化简sin2(α+π/4)-sin2(π/4-α)
如题
答
解sin2(α+π/4)-sin2(π/4-α)
=sin(2α+π/2)-sin(π/2-2α)
=cos2α-cos2α
=0