$-3a\left(a+6\right)$
$1+\frac{1}{1+x}$
$\int x^2\cdot cos\left(nx\right)dx$
$\frac{x-5}{x^2-x-2}$
$\lim\:_{r\to\:\frac{1}{3}}\left(x^2+\frac{1}{9}\right)\left(x-\frac{1}{3}\right)$
$4x^2\:+\:\:40x\:+\:49$
$5\:-\:3\left[4\:+\:2\left(5\:-\:8\right)\:-\:|-6|\right]\:$
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