$2013-7$
$\int\left(\left(t\right)\sin\left(t^2\right)\right)dx$
$\left(+2\:\right)-\left(-12\:\:\right)\:\:$
$\left(x-1\right)\cos\left(\frac{1}{x-1}\right)$
$\int\frac{x^2}{\sqrt{x^2-16}}2dx$
$\frac{1}{x^2}+4x+4$
$7a^2-28a-28$
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