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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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re: Solution | Comment 8 of 12 |
(In reply to Solution by Praneeth)

Very impressive proof!
  Posted by Charlie on 2007-11-20 09:36:16

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