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0 zero is the correct answer
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if if a b c are all non zero and a + b + c zero prove that A to B C + B2 AC + c to ab = 3
A2/BC + b 2 / ca+c2/ ab = 3
multi lication by ABC both side
A3 + B3 + C3 = 3 ABC.
as we know that a + b + c= 0
a + b= -c
-c 3 -3ab (-c) + C3 = 3abc
3abc = 3 abc.
L HS = RHS
QED
proved
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