if abc=1, show that 11+a+b−1+11+b+c−1+11+c+a−1=1

1.	if abc=1, show that 11+a+b−1+11+b+c−1+11+c+a−1=1
Answer» if abc=1, show that $\frac{1}{1 + a + b^{- 1}} + \frac{1}{1 + b + c^{- 1}} + \frac{1}{1 + c + a^{- 1}}$ =1

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