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In any ∆ ABC , prove that
a³cos ( B-C ) + b³cos ( C-A ) + c³cos ( A-B ) = 3abc
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✡ Only Stars give the answer ✡ ✡ Give the Answer in the proper way ✡
In any ∆ ABC , prove that
a³cos ( B-C ) + b³cos ( C-A ) + c³cos ( A-B ) = 3abc
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