$\left(y+11\right)\left(y-11\right)$
$\frac{1}{\sqrt{x}}\left(1+\sqrt{x}\right)^2$
$2x^2+15x+7=0$
$5x^2+y^2=0$
$\lim_{x\to0}\left(\frac{8x^4+2x^3+2x-4}{x+1}\right)$
$\lim_{x\to0}\frac{\left(sqrt\left(5x+25\right)-5\right)}{x}$
$\lim\:_{y\to+\infty\:}\left(\frac{2y^2-3y}{y+1}\right)$
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