$\lim_{x\to\infty}\left(\frac{x}{4\sqrt{4+x^2}}\right)$
$\int x\left(\sqrt{x}-4\right)dx$
$8c^2-16y^2$
$4x^2+60x+3=0$
$\left(x^a\right)^b$
$\left(x^2-3rx-2r-x\right)^2$
$\int\frac{23}{x^3-27}dx$
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