$\lim_{x\to\infty}\left(\frac{e^x}{4-x^2}\right)$
$\frac{cos\:\left(x\right)\:.\:tg\:\left(x\right)+sen\:\left(x\right)}{tg\:\left(x\right)}=\frac{2}{sec\:\left(x\right)}$
$22-\left(-44\right)+\left(-55\right)$
$-5+a-5+a-8$
$\int\left(2-x\right)\cdot\sqrt{1-x}dx$
$\frac{3x}{2}=-18$
$-5-\left(-33\right)$
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