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Ask iit jee aieee pet cbse icse state board community Community Discussion Question: Please explain
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[Post New]6 Apr 2008 12:19:29 IST
    Subject: Please explain
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rahulraj1 (14)

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If sin2 2/7+sin24/7+sin28/7=7/4
 
Prove that sin 2pi/7+sin4pi/7+sin8pi/7=root 7/2.
    
[Post New]6 Apr 2008 12:21:10 IST
    Subject: Please explain
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ravi00 (291)

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easy man dis was answered already.......check d old posts.....
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[Post New]6 Apr 2008 20:26:45 IST
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ramkumar_november (1270)

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same problem discussed .... go to this link...

http://www.goiit.com/posts/list/trignometry-trigonometry-question-50564.htm#254022
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