作者claudina (claudina)
看板trans_math
标题[考古] 98台联大
时间Sun May 13 14:55:25 2012
What is the area that lies inside the circle r=6 and above the line r=3cscθ?
r=3cscθ这条线怎麽画?
Let S be the surface parametrized by r(θ,z)=3sin2θi+6sin^2θj+zk where
0<=θ<=π. Which of the following is equivalent to the surface differential
d∂?
这两题我完全不会算,请给我完整过程,谢谢!
--
※ 发信站: 批踢踢实业坊(ptt.cc)
◆ From: 123.110.133.85
1F：推 dreamenjoy:第一题 r=3cscθ是y=3 因为r=3 1/sin 114.26.152.193 05/19 21:15
2F：→ dreamenjoy:再把sin移项 得y=3 114.26.152.193 05/19 21:16
3F：→ dreamenjoy:第二题 用jacobin算 用打的太麻烦了.. 114.26.152.193 05/19 21:17
4F：→ dreamenjoy:看课本应该有 得出答案是6θ我记得 114.26.152.193 05/19 21:17
5F：→ dreamenjoy:就代公式进去 114.26.152.193 05/19 21:17
6F：→ dreamenjoy:其实你可以去math版问 这编人比较少 114.26.152.193 05/19 21:19
7F：→ dreamenjoy:要问到答案可能比较慢 114.26.152.193 05/19 21:19
8F：→ claudina:谢谢,我等很久以为没人回了123.110.133.190 05/20 18:03