$\int\frac{\cos\left(\frac{1}{x}\right)}{x^2}dx$
$\lim_{x\to0}\left(\frac{1-e^{\left(2x+y\right)^2}}{sen^2\left(2x+y\right)}\right)$
$x^2-7x=-12$
$cotx=\frac{1}{2}$
$\frac{-5}{-2}\cdot\frac{-2}{-5}$
$4+x>5-2x$
$0.25k+1.5-k-3.50$
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