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cos40^(@)+cos 80^(@)+cos160^(@)+cos240^(...

`cos40^(@)+cos 80^(@)+cos160^(@)+cos240^(@)`=

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cos 40^(@) + cos 80^(@) + cos 160^(@) =

Prove that cos 80^(@) cos40^(@)+cos40^(@) cos200^(@) +cos200^(@) cos 80^(@) = -3/4

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

The value of cos 20^(@) cos 40^(@)cos 60^(@) cos 80^(@) is equal to

Cos 40^(@) + Cos80^(@) + Cos160^(@) + Cos240^(@) =

cos20^(@)cos40^(@)cos60^(@)cos80^(@)=

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

A=cos 20^(@)cos 40^(@) cos60^(@)cos 80^(@) , B=cos6^(@)cos42^(@)cos66^(@)cos78^(@) and C=cos 36^(@)cos72^(@)cos 108^(@)cos 144^(@) then