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Any triangle, Trigonometric function - second episode! (Posted on 2007-11-18) Difficulty: 3 of 5
Prove that in any triangle cos(A)+cos(B)+cos(C)>1

See The Solution Submitted by Chesca Ciprian    
Rating: 3.0000 (1 votes)

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  Subject Author Date
re(2): SolutionCharlie2007-11-21 09:10:11
No SubjectPraneeth2007-11-21 02:50:04
Idea, observation and a nice solution!Chesca Ciprian2007-11-20 14:51:01
re: SolutionBrian Smith2007-11-20 12:03:23
re: SolutionCharlie2007-11-20 09:36:16
SolutionSolutionPraneeth2007-11-20 06:26:28
re(3): non-Euclidean case?brianjn2007-11-19 07:58:10
re(2): non-Euclidean case?Dej Mar2007-11-19 07:33:47
re: non-Euclidean case?brianjn2007-11-19 06:59:34
Some Thoughtsnon-Euclidean case?Dej Mar2007-11-19 04:50:37
computer exploration of all anglesCharlie2007-11-18 23:16:28
non-obtuse caseDennis2007-11-18 15:21:40
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