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Algebra

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Joined:	9 Sep 2007
Post:	647

10 Mar 2009 10:47:13 IST

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A question after a long time

None

$http://www.codecogs.com/eq.latex?Prove%20%5C%20that%20:%20cos%20%5Csqrt[3]{%5Cfrac{2%5Cpi}{7}}+%20cos%20%5Csqrt[3]{%5Cfrac{4%5Cpi}{7}}%20+cos%20%5Csqrt[3]{%5Cfrac{8%5Cpi}{7}}%20=%20%5Csqrt[3]{%5Cfrac{1}{2}(5-3%5Csqrt[3]{7})}$

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Anant Kumar

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Joined: 10 Jul 2008

Posts: 598

11 Mar 2009 00:10:32 IST

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Are you sure about the problem. It is easy to check by a calculator that the LHS is positive but the RHS is negative.

Brad

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Posts: 647

11 Mar 2009 11:31:42 IST

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Didn't try the problem meticulously , but felt that the source was reliable .

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