$\int_0^{e^{-1}}\left(\frac{1}{x+1}\right)dx$
$2\:x\:-y,s\:i\:x=3.y=-6$
$\int_0^{\infty}\left(e^xsen\left(x\right)\right)dx$
$y'=2y+e^x$
$\lim_{x\to0}\left(19tanx\right)^{10cosx}$
$9xy+7x+4x-5xy+2x$
$-6-19+-14-5+-8-13+27$
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