已知sin(α+π/4)+sin(α-π/4)=根号2/3 则sin(α-π/4)/1-cos2α-sin2α的值为要详细过程
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sin(α-π/4)=12/13,sinα=
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化简sin(π/4+α)cosα-sin(π/4-α)sinα
已知sinα