$8 x ^ { 3 } + 6 x$
$4x^{2\:-12x+7}$
$1938-1120$
$\lim_{x\to4}\left(\frac{7x-16}{2x-6}\right)$
$\cos\left(2x\right)=\frac{1-\tan\left(x\right)^2}{1+\tan\left(+\right)^2}$
$\left(-\frac{5}{2}x^3y\right)\left(-\frac{3}{9}x^5y^2z\right)\left(\frac{1}{2}x^3z^3\right)$
$-x^2-4x+13$
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