$\int-5xe^{-4x}dx$
$x^2\:+\:6x\:+\:9\:>\:0$
$sec3x=2$
$\frac{d}{dx}\left(2y=\frac{x+2}{y-2}\right)$
$\frac{dx}{dy}=\frac{xy+y+3x+3}{xy+2x-y-2}$
$\lim_{x\to3}\left(\frac{x-3}{\sqrt{x+3}-2}\right)$
$2x+8>-6$
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