[" 11.The expression "cos20^(@)cos40^(@)...

[" 11.The expression "cos20^(@)cos40^(@)*cos60^(@)cos80^(@)],[" is equal to "]

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

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

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

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

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

cos20^@cos40^@cos80^@=

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

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

The value of cos20^@cos40^@cos60^@cos80^@ is equal to

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