已知sinx+cosx=1/5,(-π/2<x<0),[(3sin^2(x/2)-2sin(x/2)cos(x/2)+cos^2(x/2)]/(sinx-cosx)

已知sinx+cosx=1/5,(-π/2<x<0),[(3sin^2(x/2)-2sin(x/2)cos(x/2)+cos^2(x/2)]/(sinx-cosx)
已知sinx+cosx=1/5, (-π/2 答案:9/7
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