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[" (1) "a^(-1)b^(-1)+b^(-1)c^(-1)+c^(2)a...

[" (1) "a^(-1)b^(-1)+b^(-1)c^(-1)+c^(2)a],[" If "abc=1," show that "(1)/(1+a+b^(-1))+(1)/(1+b+c^(-1))+(1)/(1+c+a^(-1))=1],[" Simnlify the following: "]

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