$12x^2,-2x^2,4x^2$
$e=\left(x+3\right)\:\left(x-3\right)\:\left(x^2+9\right)\:+\:81$
$\sqrt{3}\cot\left(\frac{4\pi}{\:7}\right)x=1$
$\left(2x^3-3y\right)^4$
$\left(3z^2+9w\right)\left(3z+w\right)$
$u+1=16$
$\int\frac{1}{x^{2\:}-36}\:dx$
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