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cot^2(p/7) + cot^2(2p/7) + cot^2(3p/7) = 5.

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- April 21st 2008, 09:15 AMperashShow that
Show that

cot^2(p/7) + cot^2(2p/7) + cot^2(3p/7) = 5. - April 21st 2008, 12:41 PMtopsquark
- April 28th 2008, 07:07 PMJaneBennet
See this: http://www.mathisfunforum.com/viewto...d=79371#p79371

It was proved that are the roots of the equation .

Hence are the roots of the equation , i.e. of the equation .