$\lim_{x\to9}\left(\frac{x^{2}-81}{\sqrt{x}-3}\right)$
$cos\left(2x\right)=\frac{3}{5}$
$\left(a-b+7\right)^2$
$2x=2$
$\frac{\left(-5y^3+2y-1\right)}{y-2}$
$\frac{x^5-+4x^2}{x+3}$
$\left(x+3\right)\left(x+5\right)-\left(x-2\right)\left(x-7\right)\:$
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