$\left(x-3\right)\left(x+3\right)+x^2$
$4x^{2\:-12x+7}$
$cos^3\left(x\right)=cos^3\left(x\right)-3sin^2\left(x\right)cos\left(x\right)$
$-a^2+3a-2$
$\int\frac{6}{\left(x^3-4x^2+3\right)}dx$
$-8y+12xy-3y$
$-2x^2+20x+10$
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