$4-18-12$
$m^2+2mn+n\:^2-1$
$\int\frac{x^2-x+4}{\left(x+2\right)\left(x-4\right)}dx$
$-2\cot\left(\frac{\pi}{6}\right)+\frac{\pi}{6}-3\tan\left(\frac{\pi}{6}\right)$
$\frac{dx}{dy}=e^{3y+2y}$
$\frac{9x^6y^{10}}{3x^2y^5}$
$\left(ab\right)^2-3cd$
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