$\lim_{x\to8}\left(\frac{\sqrt{x+1}-3}{x^3-61x-24}\right)$
$\left(\frac{1}{y^2}-\frac{1}{x^2}\right)$
$\lim_{x\to-1}40$
$3\left(9d-1\right)+2$
$\lim_{x\to0}\:\:\frac{\cos\left(x\right)-1}{\cos\left(ax\right)-1}$
$\left(6+5y\right)^2$
$4x^4-20x^2y+25y^2$
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