作者claudina (claudina)
看板trans_math
標題[考古] 98台聯大
時間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這條線怎麼畫?
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∂?
這兩題我完全不會算,請給我完整過程,謝謝!
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◆ From: 123.110.133.85
1F：推 dreamenjoy:第一題 r=3cscθ是y=3 因為r=3 1/sin 114.26.152.193 05/19 21:15
2F：→ dreamenjoy:再把sin移項 得y=3 114.26.152.193 05/19 21:16
3F：→ dreamenjoy:第二題 用jacobin算 用打的太麻煩了.. 114.26.152.193 05/19 21:17
4F：→ dreamenjoy:看課本應該有 得出答案是6θ我記得 114.26.152.193 05/19 21:17
5F：→ dreamenjoy:就代公式進去 114.26.152.193 05/19 21:17
6F：→ dreamenjoy:其實你可以去math版問 這編人比較少 114.26.152.193 05/19 21:19
7F：→ dreamenjoy:要問到答案可能比較慢 114.26.152.193 05/19 21:19
8F：→ claudina:謝謝,我等很久以為沒人回了123.110.133.190 05/20 18:03