perplexus.info :: Geometry : Cosines everywhere

Cosines everywhere (Posted on 2005-03-21)

Prove that in any triangle ABC, 8.cos(A).cos(B).cos(C) < 1.

See The Solution Submitted by Federico Kereki

Rating: 4.5000 (2 votes)

Comments: ( You must be logged in to post comments.)

Subject	Author	Date
probable mistake	John	2006-10-16 01:18:32
re(2): This problem needs some formatting changes...	Erik O.	2005-04-05 22:38:46
Advanced Calculus Problem	Richard	2005-03-23 22:55:31
re: This problem needs some formatting changes...	Richard	2005-03-23 03:07:33
This problem needs some formatting changes...	Erik O.	2005-03-22 17:25:46
Solution	David Shin	2005-03-21 19:13:57

Please log in:

Forums (0)
Newest Problems
Random Problem
FAQ | About This Site
Site Statistics
New Comments (3)
Unsolved Problems
Top Rated Problems
This month's top
Most Commented On

Chatterbox:


perplexus dot info