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If the sides a, b, c of a triangle ABC are the roots of the equation x3−13x2+54x−72=0, then the value of cos Aa+cos Bb+cos Cc is equal to |
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Answer» If the sides a, b, c of a triangle ABC are the roots of the equation x3−13x2+54x−72=0, then the value of cos Aa+cos Bb+cos Cc is equal to |
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