$\int9cot^4xdx$
$-27\::\:-9\:$
$k^2-16k+63$
$12x^2-4x$
$\frac{d}{dx}-\frac{5}{x^{10}}-\frac{5}{6}x^{-4}$
$\lim_{x\to0}\left(\frac{\left(2-\left(\sqrt{x-2}\right)\right)}{x^2-36}\right)$
$\sqrt{2.25}$
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