Factorise (x-2y) 3 +(2y-3z) 3 +(3z-x) 3
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(x-2y)3+(2y-3z)+(3z-x)3
=3x-6y+6y-9z+9z-3x
=0
=3x-6y+6y-9z+9z-3x
=0
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