If a, b, c are in AP, prove that $a^{2} + c^{2} + 4 a c = 2 (ab + b c + c a)$ .

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If a, b, c are in AP, prove that

a^{2} + c^{2} + 4 a c = 2 (ab + b c + c a)

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Question Text

If a, b, c are in AP, prove that

a^{2} + c^{2} + 4 a c = 2 (ab + b c + c a)

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