$\lim_{n\to infinity}\frac{\left(2x\right)^n}{n^2}$
$\int\frac{4}{\left(1+x^2\right)^2}dx$
$x^2\ge-4$
$y=3lnx$
$\int\frac{-2}{\sqrt{4x-x^2}}dx$
$0.7\left(1-e^{-0.05\left(\infty\right)}\right)$
$\int\left(\frac{3x^3-2x^5+8-7x}{x}\right)dx$
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