$\left(mn+2\right)\left(2-mn\right)$
$\frac{dr\:}{d\theta\:}=\theta\:-\frac{r}{3\theta\:}$
$\left(b-2\right)\left(2b-1\right)\left(-b+1\right)$
$\tan\left(a\right)+\tan\left(b\right)$
$2\cos\left(4x-1\right)$
$\frac{2ab}{3a\:}$
$e^y\frac{dx}{dy}=3x^2+1$
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