作者andy26883372 (fly)
看板trans_math
标题[微分] 反函数微分
时间Sat Jan 10 20:39:27 2009
谢谢帮忙。
(a) If f is a one-to-one, twice differentiable function with inverse
function g, show that
f"(g(x))
g"(x)= _ --------------------------
[f'(g(x))]^3
(b) Deduce that if f is increasing and concave upward, then its inverse
function is concave downward.
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