If \( a, b, c \) are in A.P., prove that : (i) \( \frac{1}{b c}, \f...

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If \( a, b, c \) are in A.P., prove that :
(i) \( \frac{1}{b c}, \frac{1}{c a}, \frac{1}{a b} \) are in A.P.
(ii) \( (b+c)^{2}-a^{2},(c+a)^{2}-b^{2},(a+b)^{2}-c^{2} \) are in A.P.
\( \mathrm{P} \)
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