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If a, b, c are in A.P., prove that: (i)...

If a, b, c are in A.P., prove that:
(i) `1/(bc) , 1/(ca), 1/(ab)` are in A.P.
(ii) ` (b+c)^2- a^2 ,(a+c)^2- b^2 , (b+a)^2- c^2` are in A.P.

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