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[" Express the rational number "S=cos^(2...

[" Express the rational number "S=cos^(2)(10^(@))+cos^(2)(20^(@))+cos^(2)(30^(@))+...+cos^(2)(80^(@))" in lowest terms."],[[" (A) "2," (B) "3," (D) "5," (C) "4]]

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

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

Value of cos^(2) 5^(@) + cos^(2) 10^(@) + cos^(2) 80^(@) + cos ^(2) 85^(@) is

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

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

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

cos^(2)20^(@)+cos^(2)70^(@) is equal to :

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

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

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