Answer
a. $0$ b. $0$
Work Step by Step
a. Given $\lim\limits_{x \to 0}\frac{f(x)}{x^2}=1$, we have $\lim\limits_{x \to 0}f(x)=\lim\limits_{x \to 0}x^2=0$
b. $\lim\limits_{x \to 0}\frac{f(x)}{x}=\lim\limits_{x \to 0}x=0$
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