已知tanx=2,求2sin^2 x -sinxcosx+cos^2 x你们是怎么想到要添分母sin^2x+cos^2x 的我想了半天都没想出来
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![已知tanx=2,求2sin^2 x -sinxcosx+cos^2 x你们是怎么想到要添分母sin^2x+cos^2x 的我想了半天都没想出来](/uploads/image/z/1989170-26-0.jpg?t=%E5%B7%B2%E7%9F%A5tanx%3D2%2C%E6%B1%822sin%5E2+x+-sinxcosx%2Bcos%5E2+x%E4%BD%A0%E4%BB%AC%E6%98%AF%E6%80%8E%E4%B9%88%E6%83%B3%E5%88%B0%E8%A6%81%E6%B7%BB%E5%88%86%E6%AF%8Dsin%5E2x%2Bcos%5E2x+%E7%9A%84%E6%88%91%E6%83%B3%E4%BA%86%E5%8D%8A%E5%A4%A9%E9%83%BD%E6%B2%A1%E6%83%B3%E5%87%BA%E6%9D%A5)
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