I am having trouble understanding this question on limits. Suppose that $r(x)$ is a function where
$$ \lim_{x\rightarrow 0} \dfrac{r(x)}{x^2} =0 \ . $$
Can someone please explain how, from the first limit I can show that:
$$ \lim_{x\rightarrow 0} \dfrac{r(x)}{x} =0 \ . $$