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Express the rational number S= cos^2 (10...

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

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

1+ cos 10^(@) + cos 20^(@)+ cso 30^(@)=

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

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

cos20^(@).cos40^(@).cos60^(@).cos80^(@) is :

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

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

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

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