$\int\left(x^3+1\right)^63x^2dx$
$x+2x^3$
$\frac{dy}{dx}=\frac{2x+y}{-x+2y}$
$\frac{cosx}{1+cosx}=\frac{senx}{senx+tanx}$
$z^6=916$
$\int\left(\arccos\:\left(x\right)\right)^2dx$
$\lim_{x\to2}\left(\frac{x-2\cos\left(\pi2\right)}{x^2-4}\right)$
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