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If a, b, c , d are in G.P. , then shown...

If a, b, c , d are in G.P. , then shown that
(i) `(a + b)^(2) , (b +c)^(2), (c + d)^(2)` are in G.P.
(ii) ` (1)/(a^(2) + b^(2)), (1)/(b^(2) +c^(2)), (1)/(c^(2) + a^(2))` are in G.P.

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