$\frac{x^2-x-2}{x^2-7x-8}$
$\frac{1}{3}^3\:+2\:y^3-\frac{2}{5}^2y+3$
$cos^2x\:cscx=cscx$
$4ms^2-20am$
$\lim_{x\to0}\left(\frac{sin\left(2x\right)cos\left(9x\right)}{x}\right)$
$\left(3x^2y\right)\left(2x^3y^0\right)$
$\int\left(\frac{5}{x^4}\right)dx$
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