$\left(-2\right)+\left(-9\right)\cdot\frac{6}{\left(-2\right)}$
$\frac{tan\left(129^{\circ\:}\right)-tan\left(84^{\circ\:}\right)}{1+tan\left(129^{\circ\:}\right)tan\left(84^{\circ\:}\right)}$
$\frac{dy}{dx}=\sin\left(3y\right)\ln\left(x\right)$
$x-8<-4\cdot1$
$3x-5x^2-1$
$\frac{-18}{0}$
$\frac{2\left(8n^4-m^4\right)}{2n+2m}$
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