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" is) "cos^(2)10^(@)+cos^(2)20^(@)+cos^(...

" is) "cos^(2)10^(@)+cos^(2)20^(@)+cos^(2)30^(@)+cos^(2)40^(@)+cos^(2)50^(@)+cos^(2)theta/8

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cos^(2)10^(@)+cos^(2)50^(@)+cos^(2)70^(@)=?

Cos^(2)20^(@)+Cos^(2)40^(@)+cos^(2)80^(@)=

Prove that cos^(2)40^(@)cos^(2)80^(@)+cos^(2)80^(@)cos^(2)20^(@)+cos^(2)200^(@)cos^(2)40^(@)=(17)/(16)

cos^(2)10^(@)+cos^(2)50^(@)-cos10^(@)cos50^(@) is equal to

The value of cos^(2)75^(@)+cos^(2)45^(@)+cos^(2)15^(@)-cos^(2)30^(@)-cos^(2)60^(@) is

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cos ^ (2) 10 ^ (@) + cos ^ (2) 50 ^ (@) + cos ^ (2) 70 ^ (@) =

Express the rational number S=cos^(2)(10^(@))+cos^(2)(20^(@))+cos^(2)(30^(@))+...+cos^(2)(80^(@)) in lowest terms