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cos 20^(@) + cos 100^(@) + cos 140^(@) =...

`cos 20^(@) + cos 100^(@) + cos 140^(@) = `

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cos 20^(@)* cos 40^(@) * cos 60^(@) * cos 80^(@) =

1 + cos 10^(@) + cos 20^(@) + cos30^(@) =

cos^(3) 20^(@) + cos^(3) 100^(@) + cos^(3) 140^(@) =

cos 20^(@) + cos 40^(@) + cos 60^(@) +...+cos160^(@)+cos 180^(@)=

Prove that: cos20^(@)+cos100^(@)+cos140^(@)=-0