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cos40^(@)+cos80^(@)+cos160^(@)+cos240^(@...

cos40^(@)+cos80^(@)+cos160^(@)+cos240^(@)=

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

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

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

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

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

cos20^(@).cos40^(@).cos60^(@).cos80^(@)=1/16

cos20^(@).cos40^(@).cos60^(@).cos80^(@)=1/16

Prove that cos 20^(@)cos40^(@)cos60^(@)cos80^(@)=(1)/(16)

Prove that :cos20^(@)cos40^(@)cos60^(@)cos80^(@)=(1)/(16)