$\lim_{x\to3}\left(\frac{9x}{\sqrt{4x+4}-1}\right)$
$\int\frac{4}{cos2x}dx$
$\int_0^{\infty}\left(21xe^{2x}\right)dx$
$\frac{d}{dx}\left(\left(5x-4\right)\left(\sqrt{x}+4\right)\right)$
$\int\left(x^2\:cosat\right)dx$
$\frac{d}{dx}\left(\sqrt[3]{\frac{x\left(x-2\right)}{x^2+9}}\right)$
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