Answer
$ f′(x)=\lim_\limits{ h\to 0} \dfrac{f(x+h)-f(x)}{h}$
Work Step by Step
When we are given that $ y=f(x)$, then the derivative of the equation can be computed as:
$ f′(x)=\lim_\limits{ h\to 0} \dfrac{f(x+h)-f(x)}{h}$
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