$\lim\:_{x\to\:+\infty\:}\left(\frac{x-2}{x+3}\right)^{-\frac{1}{2}x}$
$\lim_{x\to0}\left(3x^2-2x+5\right)$
$cos=-\frac{4}{9}$
$x-4xy$
$\frac{3m^4n^3}{6m^3n^4}$
$\int9xe^{-9x^2}dx$
$\frac{1}{n+5}\left(x+2\right)^n$
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