решите 2 производных!!!

$f ' (x)=\frac{\frac{1}{x}(1+lnx)-lnx*\frac{1}{x}}{(1+lnx)^2}=\frac{\frac{1}{x}+\frac{1}{x}lnx-\frac{1}{x}lnx}{(1+lnx)^2}=\frac{\frac{1}{x}}{(1+lnx)^2}=\frac{1}{x(1+lnx)^2}$

$f ' (x)=2ln\sqrt{x^2+1}*\frac{1}{\sqrt{x^2+1}}*\frac{1}{2\sqrt{x^2+1}}*2x=\frac{4xln\sqrt{x^2+1}}{2(x^2+1)}$

................................................................................................................................