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[" Evaluate: "],[quad cos20^(@)*cos40^(@...

[" Evaluate: "],[quad cos20^(@)*cos40^(@)*cos60^(@)*cos80^(@)]

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

cos20^(@).cos40^(@).cos60^(@).cos80^(@) is :

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

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

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

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

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

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

cos20^(0)cos40^(0)cos60^(0)cos80^(0) is equal to