$\frac{\sqrt{n+4}}{n^2\:.4^n}$
$\lim_{x\to0}\left(2x-8\right)^{\frac{1}{3}}$
$\frac{1}{\left(1-5x\right)^3}$
$144c^4-100d$
$\lim_{z\to\infty}\left(\frac{z^3+8}{z^4+4z^2+16}\right)$
$\int\frac{x^2+1}{x^4-x^2+1}dx$
$\int_1^{ln\left(x\right)}cos\:t\:dt$
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