$-3\left(1-k\right)+k$
$10s^2+5s+10$
$\frac{1}{cosx}\left(\frac{1}{cosx}+se\right)$
$\int\left(y^2e^3\right)dy$
$3u-9u$
$cosx\:=\:-1$
$12x+y\:\:si\:x=2,\:y\:=3$
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