$\lim_{x\to\infty}\frac{x^2+9}{x^2+1}$
$\frac{n}{2^{n-1}}$
$\lim_{x\to4}\left(\frac{\sqrt{x-3}-1}{x^2-1}\right)$
$-\left(\frac{14}{e}-11\right)$
$2-99$
$\frac{8}{2}-\frac{x^2}{x}$
$12\sin\left(35\right)\cos\left(2\right)$
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