$x^4+72x+36$
$\int\frac{x^3}{\left(16+x^2\right)^3}dx$
$\lim_{x\to5}\frac{3-\sqrt{2x-1}}{3\left(\sqrt{5x-5}\right)}$
$1-\sin^2$
$\int13xe^{-2x}dx$
$\lim_{x\to5\:}\left(\frac{x}{5}\right)^{\frac{1}{x-5}}$
$\lim_{x\to0}1-\frac{\cos x}{x^2}$
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