$cot^2o-csc^2o$
$5x^2+20x+12=0$
$y^2+7y+12$
$\lim_{x\to\infty}\left(\frac{x^2+x-6}{x^2-3x-2}\right)$
$\int\:\frac{-1000}{\left(2x+50\right)^2}dx$
$\frac{x^3-27}{3x^2-9x}$
$\left(3n+6\right)\left(3n-4\right)$
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