$2\left(x^2-4x+6\right)-3x\left(x+7\right)$
$\lim\:_{x\to\:1}\frac{1+\cos\left(\pi x\right)}{\tan^2\left(\pi x\right)}$
$\left(x^3-6\right)\left(x^3+6\right)$
$3e^{xy}-x=0$
$2x^2-8x=0$
$\:\frac{a^m}{a^n}$
$\frac{6x^3}{3+2x^2}$
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