$\lim_{x\to4}\left(\frac{\sqrt{x-4}}{\sqrt{x}-2}\right)$
$4-\frac{7}{7}$
$3csc^2x-4=0$
$\frac{dy}{dx}=\frac{1+xe^x}{y+e^{e+y}}$
$\frac{y}{-3}\:=\:7$
$m^4+5m^2+9\:$
$x^2-24-11x$
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