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\left. \begin{array} { l } { \text { fa, b, care in AP, prove that } } \\ { ( a - c ) ^ { 2 } = 4 ( a - b ) ( b - c ) } \\ { a ^ { 3 } + c ^ { 3 } + 6 a b c = 8 b ^ { 3 } } \end{array} \right. |
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