[考古] 98台聯大

看板trans_math作者 (claudina)時間12年前 (2012/05/13 14:55), 編輯推噓1(107)
留言8則, 2人參與, 最新討論串1/1
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! -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 123.110.133.85

05/19 21:15, , 1F
第一題 r=3cscθ是y=3 因為r=3 1/sin
05/19 21:15, 1F

05/19 21:16, , 2F
再把sin移項 得y=3
05/19 21:16, 2F

05/19 21:17, , 3F
第二題 用jacobin算 用打的太麻煩了..
05/19 21:17, 3F

05/19 21:17, , 4F
看課本應該有 得出答案是6θ我記得
05/19 21:17, 4F

05/19 21:17, , 5F
就代公式進去
05/19 21:17, 5F

05/19 21:19, , 6F
其實你可以去math版問 這編人比較少
05/19 21:19, 6F

05/19 21:19, , 7F
要問到答案可能比較慢
05/19 21:19, 7F

05/20 18:03, , 8F
謝謝,我等很久以為沒人回了
05/20 18:03, 8F
文章代碼(AID): #1FhrhVRn (trans_math)