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=> LM^2 = (4√3)^2 + 2^2 - 2 . 4√3 . 2 . cos 60°
=> LM^2 = 48 + 4 - 8√3
=> LM^2 = 52 - 8√3
=> LM = √(52 - 8√3) = √(4(13 - 2√3) = 2√(13 - 2√3)