已知TanX,TanY是方程X^-3X-3=0的俩根,求sin^(x+y)-3sin(x+y)cos(x+y)-3cos^(x+y)的值,
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![已知TanX,TanY是方程X^-3X-3=0的俩根,求sin^(x+y)-3sin(x+y)cos(x+y)-3cos^(x+y)的值,](/uploads/image/z/2550676-4-6.jpg?t=%E5%B7%B2%E7%9F%A5TanX%2CTanY%E6%98%AF%E6%96%B9%E7%A8%8BX%5E-3X-3%3D0%E7%9A%84%E4%BF%A9%E6%A0%B9%2C%E6%B1%82sin%5E%28x%2By%29-3sin%28x%2By%29cos%28x%2By%29-3cos%5E%28x%2By%29%E7%9A%84%E5%80%BC%2C)
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