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if (a^(2) +2bc) ,( b^(2) +2ac) ,(c^(2) ...

if ` (a^(2) +2bc) ,( b^(2) +2ac) ,(c^(2) +2ab) ` are in AP, show that
`1 / (( b-c)) ,1/((c -a)) , 1/ ((a-b)) are in AP.

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