$\left(5x-2\right)\left(2x+5\right)$
$x^2+6x+9\le0$
$9-2x+7$
$\lim_{x\to0}\left(3sin\left(x\right)ln\left(x\right)\right)$
$\frac{cos}{1-sen}-sec$
$b^{-6}\cdot b^{11}$
$\lim_{x\to\infty}\left(\frac{\sqrt{2x^2+2x+3}}{2x+3}\right)$
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