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计算 integrate (1)/(x^4 + 1) dx 。提示:因式分解为 (x^2 + sqrt(2)x + 1)(x^2 - sqrt(2)x + 1) 。
计算 integrate (1)/(x^4 + 1) dx 。提示:因式分解为 (x^2 + sqrt(2)x + 1)(x^2 - sqrt(2)x + 1) 。
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