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[" 8."cos20^(@)+cos100^(@)+cos140^(@)=],...

[" 8."cos20^(@)+cos100^(@)+cos140^(@)=],[" a) "cos130^(@)quad " b) "cos45''],[" c) "0," d) none of these "]

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

cos 20^(@) + cos 100^(@) + cos 140^(@) =

cos 20^(@) + cos 100^(@) + cos 140^(@) = 0

cos20 ^ (@) cos40 ^ (@) cos80 ^ (@) =

cos20^(@)cos40^(@)cos60^(@)cos80^(@)=

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

cos20 ^ (@). cos40 ^ (@). cos60 ^ (@) cos80 ^ (@) =

1 + cos 10^(@) + cos 20^(@) + cos30^(@) =

cos 20^(@) + cos 100^(@) + cos 140^(@)= A) cos 130^(@) B) cos 45 ^(@) C)0D)none of these