[" 55."cos20^(@)*cos40^(@)*cos60^(@)*cos...

[" 55."cos20^(@)cos40^(@)cos60^(@)*cos80^(@)=],[1.3/16,2.1/32]quad " 3."1/16quad 4.1/8

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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^(@)=

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

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

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

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

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