$\left(\sqrt{x}+3\right)\left(\sqrt{x}-3\right)\left(x+9\right)+\left(x+8\right)\left(x-8\right)$
$\left(1+x\right)^{\frac{1}{2}}\left(1-x\right)^{-\frac{1}{2}}$
$4m\left(3m^3n^2-4n\right)$
$x+1,\:9-x^2$
$\int\frac{1}{\sqrt{1+x+x^2}}dx$
$5x^2+9x=-4$
$\lim_{x\to+\infty}\left(1+\frac{1}{x^3}\right)^{2x}$
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