$\left(ab-3ab\right)\left(2a^2b+a^2\right)$
$\int8cos^42\pi xdx$
$4m^2-81$
$12xy^3z^6\:\:4x^5yz^{12}.$
$\left(3-\sqrt{5}\right)\left(3+\sqrt{5}\right)$
$\int\frac{x^2}{x^4-42x^2-343}dx$
$\frac{d}{dx}xye2+x-2y-1=0$
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