$\left(x+3\right)\left(y+3-x^2\right)$
$\cot^2\left(x\right)+13\:\cot\left(x\right)$
$x=x^2+2x$
$x^2-4x+7$
$\lim_{x\to\infty}\left(1+2x^{\frac{1}{x}}\right)$
$\left(-1.2\right)\cdot3$
$\left(2a+2\right)\left(2a+4\right)$
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