设f(x)为二阶可导函数,且f(tanx)=1+sin^2x\cos^2x,求f''(x)是(1+sin^2 x)\cos^2 x

问题描述:

设f(x)为二阶可导函数,且f(tanx)=1+sin^2x\cos^2x,求f''(x)
是(1+sin^2 x)\cos^2 x