$2x^2-12x+16=0$
$a^2b^2+a^3b^3-ab$
$\sin\left(90+b\right)=\sin\left(90\right)\cdot\cos\left(b\right)+\cos\left(90\right)\cdot\sin\left(b\right)$
$\frac{dy}{dx}=\frac{x-1}{xy+6x-9y-54}$
$8ax+7ax-3ax$
$2y^2+9y-5$
$\left(\frac{-4}{1}z\right)-\left(\frac{3}{5}z\right)$
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