Yes, you made it much more simplified.

来源: 于 2008-10-23 06:33:25 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

it doesn't need 积分. use 余弦定理 to find v-angle A equation. The key step is find minimum v. Now, I believe the correct line.