1.

:\left|\frac{ |x^{2}-y^{2} \rangle^{3}+\left(y^{2}-z^{2}\right)^{3}+\left(z^{2}-x^{2}\right)^{3}}{(x-y)^{3}+(y-z)^{3}+(z-x)^{3}}\right.

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