math question about derivative(导数). 谢谢.答对了.会加分...加到你满意.题目如下：谢谢各位数学达人啦!

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$math question about derivative(导数). 谢谢.答对了.会加分...加到你满意.题目如下：谢谢各位数学达人啦!$

math question about derivative(导数). 谢谢.答对了.会加分...加到你满意.题目如下：谢谢各位数学达人啦!
math question about derivative(导数). 谢谢.答对了.会加分...加到你满意.
题目如下：
谢谢各位数学达人啦!

math question about derivative(导数). 谢谢.答对了.会加分...加到你满意.题目如下：谢谢各位数学达人啦!
分数f/g的求导公式为：
(f'g - fg')/g^2
所以这题的答案是：
-3[e^x-e^(-x)]/[e^x+e^(-x)]^2

You should use the chain rule here.
g(X)=3(e^x+e^-x)^-1
let (e^x+e^-x) be "a"
d g(x)/d (x)=[d g(x)/d (a)] * d (a)/d (x)
g' (x)= -3(e^x+e^-x)^-2 * (e^x - e^-x)
try this answer and don't forget the minus sign at the beginning.
给我分啦~~

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