$\left(4x^3y+6\right)$
$\lim_{x\to1}\left(\frac{ln\:x^3}{x^2-1}\right)$
$2c\left(c+7\right)=0$
$13a^2+7a-6$
$3a+5ab^2c\left(3a-5b^2c^2\right)$
$cos^2u$
$\lim_{x\to4}\left(\frac{x^{2}-15}{x^{2}-16}\right)$
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