$\sqrt{\frac{x}{x-4}}$
$\int\frac{x}{\sqrt{8-\left(x-2\right)^2}}dx$
$\sqrt[9]{\left(-8\right)^9}$
$\lim_{x\to+infinity}\left(\frac{x+\cos\left(x\right)}{2x+1}\right)$
$\lim_{x\to\infty}\left(\sqrt{x^2+4x+11}-x\right)$
$( 2 m ^ { 2 } - x ^ { 4 } ) ^ { 3 }$
$76-43-54+87+91$
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