作者HGL (谁来救诚泰娘子军)
看板trans_math
标题[偏微]&[证明]
时间Sun Jun 26 00:54:50 2005
1). Suppose that the partial derivatives of a function f(x,y,z) at points
on the helix x=cost y=sint ,z=t are
af af af
--=cost --=sint --=(t^2)+t-2
ax ay az
at what points on the curve,if any,can f take on extreme values.
2). Show that the equation 3x-2+cos(拍x/2)=0 has exactly one real root.
(要用哪种方法呢?! 拍:就是3.1416...那个符号= =")
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麻烦有空有闲的大大 帮忙解一下
拜托了 小弟太笨了XD
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