$\frac{2x^2+x-21}{2-\sqrt[5]{3x^2+5}}$
$\frac{x^2}{81}+\frac{y^2}{36}$
$\int5x\:\cdot\:\left(2x+1\right)^2dx$
$1-m^2$
$\lim_{x\to-2}\left(\frac{x^2-1}{x^2+3x+2}\right)$
$25+\:10t\:+\:t^2$
$\left(4x-6\right)\left(4x-2\right)$
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