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∫(cos x)^3dx=?上限是二分之派,下限是负的二分之派.
人气:201 ℃ 时间:2020-06-07 01:15:03
解答
∫[-π/2,π/2](cos x)^3dx
=∫[-π/2,π/2](1-sin^2x)dsinx
=(sinx-1/3sin^3x)[-π/2,π/2]
=1-1/3+1-1/3
=4/3
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