f(x+y)=f(x)f(y) f(0) =1 f\'(x) =lim(h->0) [f(x+h) -f(x) ]/h =lim(h->0) [f(x)f(h) -f(x) ]/h =f(x) .lim(h->0) [f(h) -1 ]/h =f(x) .lim(h->...
