高数.求 y=ch^2(x-1/x+1)的导数

问题描述:

高数.求 y=ch^2(x-1/x+1)的导数

你好!令u=(x-1)/(x+1)v=ch u = [e^u +e^(-u)] /2y=v^2 u'=[(x+1)-(x-1)] / (x+1)^2 = 2/(x+1)^2v'=[e^u -e^(-u)] /2 *u' = (sh u)*u'y'=2v*v'∴y'= [e^u +e^(-u)] * [e^u -e^(-u)] /2 * 2/(x+1)^2=[e^(2u) -e^(-2u...