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 sinx=2cosx 或者 sinx=-cosx
①sinx=2cosx时
tanx=1/2 则 x=arctan1/2
②sinx=-cosx => tanx=-1
则 x=3∏／4
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