If A.B.C is three sides of a triangle, then the value of A4 + B4 + c4-2a2b2-2b2c2-2a2c2 is a. positive B. negative C. positive or negative D. non negative

When a = 1, B = 0, C = 0, the value of this formula is 1
When a = 1, B = 1, C = 1, the value of this formula is - 3
So this formula can be positive or negative

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