请教一道微积分?
3个回答
展开全部
1) 2∫ [0, pi/2] dθ ∫[0, 2cosθ] r^2 dr
= 2∫ [0, pi/2] (8/3) cos^3θ dθ
= 2∫ [0, pi/2] (8/3) (1-sin^2θ) dsinθ
= (16/3)[sinθ - sin^3θ/3] | [0,pi/2]
= 32/9
2) ∫ [0, 2pi] dθ ∫[0, 2] r^2 dr - 32/9
= 16pi/3 - 32/9
= 2∫ [0, pi/2] (8/3) cos^3θ dθ
= 2∫ [0, pi/2] (8/3) (1-sin^2θ) dsinθ
= (16/3)[sinθ - sin^3θ/3] | [0,pi/2]
= 32/9
2) ∫ [0, 2pi] dθ ∫[0, 2] r^2 dr - 32/9
= 16pi/3 - 32/9
已赞过
已踩过<
评论
收起
你对这个回答的评价是?
推荐律师服务:
若未解决您的问题,请您详细描述您的问题,通过百度律临进行免费专业咨询