[偏微]&[證明]
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.
(要用哪種方法呢?! 拍:就是3.1416...那個符號= =")
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麻煩有空有閒的大大 幫忙解一下
拜託了 小弟太笨了XD
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