Prove that among any four distinct numbers from the interval (0,pi/2) there are two, say, x and y such that

8 cos x cos y cos (x-y) + 1>4(cos^2 x + cos^2 y)

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- June 14th 2011, 06:41 AMhooketrigo proof 2
Prove that among any four distinct numbers from the interval (0,pi/2) there are two, say, x and y such that

8 cos x cos y cos (x-y) + 1>4(cos^2 x + cos^2 y) - June 14th 2011, 11:59 AMAlso sprach ZarathustraRe: trigo proof 2
- June 14th 2011, 12:15 PMOpalgRe: trigo proof 2
- June 15th 2011, 06:31 AMhookeRe: trigo proof 2