$\lim_{x\to3}\left(\frac{x}{\sqrt{x^2-9}}\right)$
$\left(4\sqrt{9}+3\sqrt{25}\right)+\left(11\sqrt{4}-9\sqrt{4}\right)$
$\left(7:\:\:-4\right)$
$-4xy^3+-7xy^3$
$c^2-11c+44$
$\int\frac{x^2}{\left(x^2-4\right)^{\frac{3}{2}}}dx$
$x+xy^2-2xy$
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