$\int\frac{x}{2x^2+7x+4}dx$
$\lim_{y\to0}\left(\frac{\sin^2\left(3y\right)}{3y}\right)$
$-3\:+\:\left\{-7\right\}\:+\:8\:-\:\left\{-5\right\}$
$\cos^2b+\left(1+\sin b\right)^2=2$
$sen^2\:-45$
$-1^2-2$
$\ln\left(x-1\right)+\ln\left(x^2+1\right)$
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