$\lim_{x\to0}\left(6xe^{\frac{1}{x}}\right)$
$2+9x+5+6x$
$3^7+3^{-4}$
$\lim_{x\to3}\left(\frac{1-\cos\left(x\right)}{x^2}\right)$
$\left(7c+2w\right)\left(7f-3w\right)$
$\left(4c^2+2y\right)\left(4c^2-2y\right)$
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