Show that in any triangle ABC the following inequality holds:cosA+cos B+cos C is less than equal to 3/2 . What is the minimal value of the sum?

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- October 31st 2009, 08:51 AMmakenqau1sum of cosinesShow that in any triangle ABC the following inequality holds:cosA+cos B+cos C is less than equal to 3/2 . What is the minimal value of the sum?
- October 31st 2009, 05:40 PMredsoxfan325