圖片參考:http://img5.imageshack.us/img5/8581/tripleintegral.jpg
4: 我計倒 4/5 + 4/15 .....=0="
1: 我計倒 -324π ..搵唔倒有邊度反轉左丫...
4: ∫∫∫dz r dr dθ 0≤θ≤2π 0≤r≤2
-√(36-r^2) ≤ r ≤ √(36-r^2) 咁樣計唔出, 定係我搞錯晒!? ><
更新1:
唔該晒AR!! 呢個係spherical~ 咁cylindrical 用 r drdθ set up係點!? 比個integration limit就OK~ THX!!
更新2:
咦又好似係..一陣再睇睇先..THX^^