Cho\(\mathop {\lim }\limits_{x \to 3} f\left( x \right) = 4\), chứng minh rằng: \(\mathop {\lim }\limits_{x \to 3} \sqrt {f\left( x \right)} = 2\).

Cho\(\mathop {\lim }\limits_{x \to 3} f\left( x \right) = 4\), chứng minh rằng:

\(\mathop {\lim }\limits_{x \to 3} \sqrt {f\left( x \right)} = 2\).