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substitute c = root(a^2+b^2 - 2ab*cosA) in root[(a+b+c)/2)(a+b-c)/2)(a+c-b)/2)(b+c-a)/2]
substitute c = root(a^2+b^2 - 2ab*cosA) in root[(a+b+c)/2)(a+b-c)/2)(a+c-b)/2)(b+c-a)/2]
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