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Question

Find the value of (12x13y)3+(13y14z)3+(14z12x)3=m(12x13y)(13y14z)(14z12x). Find m.

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Solution

(12x13y)3+(13y147)3+(14712x)3=3(12x13y).(13y147)(14712x)
Let,12x13y=a13y147=b14712x=ca+b+c=12x13y+13y147+14712x=0Ifa+b+c=0thena3+b3+c3=3abc
From above ,we can say that M=3.

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