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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)

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I dont know why? | Comment 6 of 7 |

I dont know why even when the solution which is valid is submitted long back is not yet updated in this site....still stating no solution yet statement on this web page...was the solution submitted already is wrong? or is there any technical difficulty in updating the site regularly?

 


  Posted by Pemmadu Raghu Ramaiah on 2005-01-24 19:36:11
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