`cos^(2)5^(@) +cos^(2)10^(@) + cos^(2) 15^(@) +…..+cos^(2) 85^(@) + cos^(2) 90^(@) `is equal to

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cos^(2) 5^(@) + cos^(2) 10^(@) +cos^(2) 15^(@)+...+cos^(2)360^(@)=

cos^(2)5^(@)+cos^(2)10^(@)+cos^(2)15^(@)+.....+cos^(2) 90^(@)=

cos^(2)5^(@)+cos^(2)10^(@)+cos^(2)15^(@)+..+cos^(2)355^(@)

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

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

The value of cos ^(2) 10^(@) cos 50^(@) + cos ^(2) 50^(@) is equal to

The value of cos ^(2) 10^(@) - cos 10^(@) cos 50^(@) + cos ^(2) 50^(@) is equal to

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

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