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If the expression x^2+2(a+b+c)+3(b c+c+a...

If the expression `x^2+2(a+b+c)+3(b c+c+a b)` is a perfect square, then `a=b=c` b. `a=+-b=+-c` c. `a=b!=c` d. `non eoft h e s e`

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