$x^3+x^2+12x$
$x^2y^2-4x^2y^2+4x^2y^2$
$s^2+s-20$
$\lim_{x\to\frac{\pi}{2}}\left(\frac{1-sin\left(x\right)}{cos\left(x\right)}\right)$
$1+tan^2\:sec^2$
$\frac{2x^4-7x^3+7x^2-13}{x-2}$
$\frac{1}{4}t^2-\frac{9}{4}t=1$
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