$\left(\left(-2\right)-0\right)^2+\left(2-\left(-4\right)\right)^2$
$m^2-2mn-3^2$
$( 6 x - 3 y ) ( 2 x - 7 y )$
$\frac{\sin^{2}x+1-2\cos^{2}x}{\cos^{2}x}$
$\lim_{x\to\infty}\left(\frac{\sqrt{3x+3}-3}{x^2-4}\right)$
$x\frac{dy}{dx}+6y=3xy^{\frac{2}{3}}$
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