2sin^2*x-sinx*cosx-cos^2*x=1
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2sin^2*x-sinx*cosx-cos^2*x=12sin^2*x-sinx*cosx-cos^2*x=12sin^2*x-sinx*cosx-cos^2*x=12sin^2*x-sinx*co
2sin^2*x-sinx*cosx-cos^2*x=1
2sin^2*x-sinx*cosx-cos^2*x=1
2sin^2*x-sinx*cosx-cos^2*x=1
2sin^2*x-sinx*cosx-cos^2*x=1
即sin^2*x-sinx*cosx-2cos^2*x=0
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则 x=3∏/4
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