f(x)=f(0)+x+a(x),lim(x~0)a(x)/x=0,f `(0)=?

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f(x)=f(0)+x+a(x),lim(x~0)a(x)/x=0,f`(0)=?f(x)=f(0)+x+a(x),lim(x~0)a(x)/x=0,f`(0)=?f(x)=f(0)+x+a(x),l

f(x)=f(0)+x+a(x),lim(x~0)a(x)/x=0,f `(0)=?
f(x)=f(0)+x+a(x),lim(x~0)a(x)/x=0,f `(0)=?

f(x)=f(0)+x+a(x),lim(x~0)a(x)/x=0,f `(0)=?
f'(0)=lim(x~0)[(f(x)-f(0))/x]
=lim(x~0)[(x+a(x))/x]
=1+lim(x~0)a(x)/x
=1