Ασκηση στη συνεχεια

f συνεχης στο x_0=a και \lim_{h\rightarrow 0}\frac{f(a+h)}{h}=1

Να αποδειξετε οτι \lim_{x\rightarrow a}\frac{f(x)-f(a)}{x-a}=1

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