If \( a, b, c \) are in A.P., prove that \[ a^{3}+c^{3}+6 a b c=8 b^{3} \text {. } \]

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If \( a, b, c \) are in A.P., prove that
\[
a^{3}+c^{3}+6 a b c=8 b^{3} \text {. }
\]
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