$\int9\arctan\left(x\right)dx$
$\:\frac{dy}{dx}+\frac{9}{40}y=-\frac{81}{32}$
$\lim_{x\to0}\left(\frac{x-2sen\left(x\right)}{tan\left(x\right)}\right)$
$\lim\:_{x\to\:\:1}\left(\frac{e^x+\sin\:\left(x\right)-1}{\ln\:\left(1+x\right)}\right)$
$8-7x\ge3x+5$
$x^2+33x-1300$
$2x\left(4x+15\right)$
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