$\frac{d}{dx}\left(\frac{y}{x}+\frac{x}{y^2}\right)$
$-4n+8+9n-2$
$\left(4m^3+6n^3\right)^3$
$4\left(3x+2y\right)$
$x^2+5x+4\ge0$
$x^2+3x^3-x$
$+\:94+\:+40$
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