爱上海后花园

已知cos(π/4+x)=3\5,求(sin2x-2sin^x)/1-tanx的值

=2sinxcosx2sin178;x1sinacosx=2sinxcosxsinx[cosxsinxcosx]=2sinxcosx=sin2x=cos22x=[2cos178;4x1]=725...

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