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If a + b + c = 0, then what is the value...

If a + b + c = 0, then what is the value of
`1/((x^(a)+x^(-b)+1))+1/((x^(b)+x^(-c)+1))+1/((x^(c)+x^(-a)+1))=?`

A

1

B

0

C

abc

D

x

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The correct Answer is:
A
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