If abc=1,show that
(1+a+1/b)^-1+(1+b+1/c)^-1+(1+c+1/a)^-1=1
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1+1+1/1) -1+1+1 +1/1)-1+1+1/1)-1=1
3-1+1-1+1/1)-1 +1+1/1)-1=1
3)1)-1
2-1=1
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