$\int\:\frac{2}{x^2-1}dx$
$498\:+\:223\:$
$\sin\left(a\right)\frac{2}{5}+\cos^2\left(a\right)=1$
$\sec^2xdy+\csc\left(y\right)dx=0$
$\int_2^{\infty}\left(xe^{-6x^2}\right)dx$
$2x^2+4xy-8$
$-\left(-10\right)+\left(-20\right)-\left(+50\right)+\left(+40\right)$
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