[問題] 還是清大89..
A snake is moving along the path y=x^(-1/2) in the x-y plane.
Suppose that at time t>0, its head is at the position(2t, (2t)^(-1/2))
and its tail is at (t, t^(-1/2)). For t>0, find the time t such that the
snake has shortest arc length.
我是這樣列的..
2t
S (1+0.25a^(-9/4))^(1/2) da
t
求其最小
可是不會積..
--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 140.115.220.154