Let f (x) be differentiable at x = 0 and f (0) = 0, then limx tends to 0, f (x) / x =?

Let f (x) be differentiable at x = 0 and f (0) = 0, then limx tends to 0, f (x) / x =?

limf(x)/x=lim[f(x)-f(0)]/(x-0)=f'(0)
This is the definition of derivative