(2x^2-1)/(x^4+2x^2+1)的不定积分,答案是, 1/2arctanx-3x/(2+2x^2)+c,求过程,我怎么算不对.

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(2x^2-1)/(x^4+2x^2+1)的不定积分,答案是, 1/2arctanx-3x/(2+2x^2)+c,求过程,我怎么算不对.

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