$-571-\left(-497\right)$
$\frac{cos^2x-1}{tan\left(x\right)}$
$\sqrt[2]{3x^2+6}-3$
$\left(\frac{1}{2}x+3\right)^3$
$\left(x-8\right)\left(x+17\right)$
$\frac{x-x^2}{1+x}$
$-11x^6-3x^2$
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