$2\:-\:\left[\:4\:+\:5\:\left(\:6\::\:3\:-\:3\right)\:-1\right]=\:$
$2x^2+2x-40$
$\int\:\frac{2t-1}{t^2+t-2}dt$
$\left(x-3\right)^2-\left(x+3\right)^2$
$\left(7x^2\right)\left(x^{-5}\right)$
$\int_{\pi\:}^{0\:}\:tanx\:dx$
$\int\:\:xe^{-x}\:dx$
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