$5cotx+4=-1$
$\lim_{x\to\infty}\left(\frac{\sin\left(\frac{2}{x}\right)}{\sin\left(\frac{1}{x}\right)}\right)$
$\:\left(\frac{x^3}{4}+\frac{3}{2}\right)^2$
$\left(y^{-8}\right)^{-1}$
$\sqrt{4x^4}-4$
$\frac{\left(x^2-3x-4\right)}{x^2-4x+5}$
$\lim_{x\to-\infty}\sqrt{x^2+4}-\sqrt{x^2+x+1}$
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