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[" 46.Prove that "(1)/(1+p+q^(-1))+(1)/(...

[" 46.Prove that "(1)/(1+p+q^(-1))+(1)/(1+q+r^(-1))],[quad +(1)/(1+r+p^(-1))=1," if "pqr=1],[" Directions for questions "47" and "48:" Simplif "]

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