$\lim_{x\to\infty\:}\left(\frac{13-81^{\frac{489}{x}}}{4}\right)^x$
$\left(5m\:-\:2n\right)^2$
$34\cdot65$
$\left(x^{\frac{1}{3}}-x\right)^2$
$\frac{1-b^{12}}{1+b^3}$
$\cos^{-1}\left(\cos\frac{4\pi}{5}\right)$
$\int\frac{x^3}{\sqrt{x^2+6}}dx$
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