$\frac{m^3n^{-5}}{m^{-2}n^{-2}}$
$\int\frac{\cot^3\sqrt{x}}{\sqrt{x}}dx$
$\frac{9x^4-x}{x^2+1}$
$\lim_{x\to0}\left(\frac{1-sin\left(x\right)-e^x}{\left(tan\left(2x\right)\right)^2}\right)$
$x^2-3x+15^2$
$3x^2-18x+9^2$
$\frac{2x^2+5x-18}{x+4}$
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