The value of `2(cos^(2)20^(@)+cos^(2)140^(@)+cos^(2)100^(@))` is

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

The value of cos^(2)20^(@)sin^(2)100^(@)+cos20^(@)cos100^(@) is -

The value of cos^(2)10^(@)-cos10^(@)cos 50^(@)+cos^(2)50^(@) is k/2 . The value of k is ________.

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

cos^(3) 20^(@) + cos^(3) 100^(@) + cos^(3) 140^(@) =

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

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

Find the value of (cos^(2)20^(@)+cos^(2)70^(@))/(sin^(2)59^(@)+sin^(2)31^(@)) .

Find the value of cos^(2)1^(@)+cos^(2)2^(@)+cos^(2)3^(@)+ -----+cos^(2)87^(@)+cos^(2)88^(@)+cos^(2)89^(@)+cos^(2)90^(@)