y=ln cos(e^x)的导数

网友回答

dy/dx=[d(ln cos e^x) / d(cos e^x)] × [d(cos e^x) / e^x] × [d(e^x) / x]
=[1/(cos e^x)] × [- sin e^x] × [e^x]
= - (tan e^x) × e^x