∫1/x到1 [f(u)-f(1/x)]du 求导

问题描述:

∫1/x到1 [f(u)-f(1/x)]du 求导

设 g(x) = ∫[1/x,1] [f(u)-f(1/x)] du = ∫[1/x,1] f(u) du - f(1/x)* (1-1/x) g '(x) = - f(1/x) * (-1/x²) - f ' (1/x)* (-1/ x²) ( 1-1/x) - f(1/x)*(1/ x²)= f ' (1/x)* (1/ x²) ( 1-1/x)=...