$\left(a+m\right)\left(a-m\right)$
$36x^2-12x-1$
$\left(a+9\right)\left(a-9\right)$
$5x-4=21$
$\lim_{x\to\infty}\left(\frac{1}{x-1}\right)$
$\left(-21\right)-\left(-30\right)+\left(-7\right)$
$\int\frac{csch^2x}{2\:+\:cothx}dx$
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