$n^2-14n+0$
$\lim_{x\to1}\left(\frac{5x}{\sqrt{x+2}}\right)$
$\left(3-\sin\right)\left(3+\sin\right)$
$\left(9a^2\right)\left(4b\right)$
$\frac{dy}{dx}=4xcos^2y$
$4y+7y^{2}+7x-x+3y+x-4y$
$35x-9x^2$
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