$\int\left(\frac{2}{\left(x+2\right)\left(x-1\right)}\right)dx$
$csc^2+tg^2-sec^2$
$2\left(-13\right)+19-7$
$\lim_{n\to\infty}\left(1+\ln\left(1+\frac{1}{n}\right)\right)^2$
$2x^2\:-4$
$2+3m-12$
$6x^3-3x^2+2x-5\:\:\:\:si\:x=-3$
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