$14x^7-9x+2x^2+3x^7-x^2-3x$
$xy\left(x^2y^7-y^2+x^{-6}y^{-9}-xyz+3\right)$
$\left(3x-8\right)\left(3x-2\right)$
$\left(3x^2\right)\left(x^8+6\right)$
$49x^2-392x+809$
$\lim_{x\to3}\left(\frac{x^2}{1-cos\left(x\right)}\right)$
$\sec\left(\tan^{-1}\left(u\right)\right)$
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