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" 3.The value of "(cos^(2)5^(@)+cos^(2)1...

" 3.The value of "(cos^(2)5^(@)+cos^(2)10^(@)+cos^(2)15^(@)+....+cos^(2)360^(@))=

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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

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

The value of cos^(2)10^(@)-cos10^(@) cos 50^(@) + cos^(2) 50^(@) is

The value of (cos ^(6)5^(@)-15 cos ^(4) 5^(@) sin ^(2)5^(@)+15 cos ^(2)5^(@)sin ^(4) 5^(@)-sin ^(6)5^(@)) is equal to-

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