[" Q."13quad cos20^(@)*cos40^(@)*cos60^(...

[" Q."13quad cos20^(@)cos40^(@)cos60^(@)*cos80^(@)=],[" 1) "018],[" 2) "1/16],[" 3) "416],[" 4) "1/32]

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

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

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

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

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

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

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

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

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

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