计算In=∫-11(x2-1)ndx.

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问题 计算In=∫-11(x2-1)ndx.

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答案由分部积分可得 In=x(x2-1)n-11-2n∫-11x2(x2-1)n-1dx =一2n∫-11(x2-1)ndx-2n∫-11(x2-1)n-1dx =-2nIn-2nIn-1, 故 [*] 递推得 [*]

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