用凑微分法解答
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:数学作业 时间:2024/07/28 10:32:49
用凑微分法解答
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![用凑微分法解答](/uploads/image/z/2628381-21-1.jpg?t=%E7%94%A8%E5%87%91%E5%BE%AE%E5%88%86%E6%B3%95%E8%A7%A3%E7%AD%94%26nbsp%3B%26nbsp%3B%26nbsp%3B)
(1):∫x^2(1+x^3)^(1/3)dx=1/3*∫(1+x^3)^(1/3)d(x^3+1)=1/4*(x^3+1)^(4/3)+c
(2):∫sinx*(cosx)^(-3/2)dx=-∫(cosx)^(-3/2)dcosx=2*(cosx)^(-1/2)+c
(3):∫sinxcosx/[1+(sinx)^4]dx=∫sinx/[1+(sinx)^4]dsinx=1/2*∫1/[1+(sinx)^4]d(sinx)^2
=1/2*arctan[(sinx)^2]+c
(2):∫sinx*(cosx)^(-3/2)dx=-∫(cosx)^(-3/2)dcosx=2*(cosx)^(-1/2)+c
(3):∫sinxcosx/[1+(sinx)^4]dx=∫sinx/[1+(sinx)^4]dsinx=1/2*∫1/[1+(sinx)^4]d(sinx)^2
=1/2*arctan[(sinx)^2]+c