An algebra problem by Aman Goenka

Algebra Level pending

$$( X^{2} -YZ)^{3} + ( Y^{2} -ZX) ^{3} + (Z^{2}-XY)^{3} - 3( X^{2} - YZ) (Y^{2} -ZX)( Z^{2} - XY)$$

Is this a perfect square YES or NO??? If YES then whats its square root.... And if NO then whats its square root?????

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