$w\left(w+1\right)=0$
$sin\:2x=cos\:2y$
$x\left(y-1\right)dx+y\left(x-1\right)dy$
$x+y+2\sqrt{xy}$
$\lim_{x\to4}\left(\frac{\sqrt{x+2}-\sqrt{2}}{x}\right)$
$9x^2-9x-108$
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