$x^3-x^9$
$\frac{24x^3-12x^2+48x^1}{3x}$
$\int\frac{1}{\tanh x}dx$
$3m\left(m-2n\right)+4\left(m-2n\right)$
$\lim_{x\to0}\left(\frac{2}{tan\left(x\right)}-\frac{4}{x^2}\right)$
$x^2-4x+20$
$\int_0^4e^xdx$
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