$\frac{m^2-81n^2}{m-9n}$
$cosx\left(cos2\theta\:-cos^2\theta\:\right)$
$\int_{-4}^2\left(e^{2x}\right)dx$
$\left(\frac{3}{5}x^3y^2\right)^3$
$\int_2^{\infty}\left(x^4\right)dx$
$\left(a-2b-c^2\right)^2$
$17-7+7-8+2-8$
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