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[" The value of "cos20^(@)cos40^(@)cos60^(@)cos80^(@)" is "],[[" (a) "(1)/(8)," (b) "(1)/(16)," (c) "(1)/(32)," (d) "(1)/(64)]]

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The value of cos40^(@)+cos80^(@)+cos160^(@) is

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

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

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

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

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

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

cos20^@cos40^@cos80^@=

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