$\left(3x+9\right)\left(3x+3\right)$
$6x^3y^2-\frac{8}{3}x^3y^2$
$\lim\:_{x\to\:5}\frac{\left(x+3\right)}{5-x}$
$xy^2-xz^2$
$\lim_{x\to2}\left(4\right)$
$\frac{\left(21-24\right)^3}{-11-4\left(4\right)}$
$cos\left(69\right)cos\left(24\right)+sin\left(69\right)sin\left(24\right)$
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