\lim_{a} b \\
\\
\lim_{x \to \infty} x = \infty \\
\\
\lim_{x \to ∞} \sqrt{x + \frac{1}{x}} = \infty \\
\\
\lim_{x \to ∞} \sqrt{x + \frac{1}{x}} = \frac{1}{2}
