Matlab - Derivada del limite de la funcion neperiano

syms x;

f = limit(log(x));

diff(f,x)

>> syms x h,  limit((log(x + h) - log(x))/h, h, 0)

ans =

1/x

>> version

ans =

8.5.0.197613 (R2015a)

syms x dx

y=(log(x+dx)-log(x))/dx;

limit(y,dx,0)