$x^2+12x+33$
$14ab-28a^2b^2$
$\frac{6}{x+4}-\frac{2}{x+4}$
$\frac{cos\left(2x\right)+1}{sin\left(2x\right)\cdot tan^2\left(x\right)}=\:\frac{1}{tan^2\left(x\right)}$
$-2\left(-6c\:+\:6\right)\:=\:12c$
$24abx+20ab$
$3x-4y+\left(2x-y\right)\frac{dy}{dx}=0$
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