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Trigonometric Fun (Posted on 2004-12-06) Difficulty: 4 of 5
Show that cos(π/7) - cos(2π/7) + cos(3π/7) = 1/2.

See The Solution Submitted by SilverKnight    
Rating: 3.6667 (3 votes)

Comments: ( You must be logged in to post comments.)
  Subject Author Date
SolutionSolutionK Sengupta2007-05-28 13:33:23
I dont know why?Pemmadu Raghu Ramaiah2005-01-24 19:36:11
re(2): Arbitrary EvaluationCeeAnne2004-12-06 23:34:53
re: SolutionCharlie2004-12-06 21:50:53
re: Arbitrary EvaluationCharlie2004-12-06 21:34:51
Arbitrary EvaluationCeeAnne2004-12-06 21:20:43
SolutionSolutionNick Hobson2004-12-06 21:10:32
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