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[cos^(2)10^(@)+cos^(2)50^(@)+cos^(2)70^(...

[cos^(2)10^(@)+cos^(2)50^(@)+cos^(2)70^(@)=?],[[" (a) "(1)/(2)," (b) "1],[" (c) "(3)/(2)," (d) "2]]

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sin^(2)50^@+cos^(2)50^@=?

cos 10^(@) cos 30^(@) cos 50^(@) cos 70^(@) =

cos10^(0)cos30^(0)cos50^(@)cos70^(0)

cos^(2)10^(@)+cos^(2)50^(@)-cos10^(@)cos50^(@) is equal to

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

cos 10^(@) cos 30^(@) cos 50^(@) cos 70^(@) =(3)/(16)

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

The value of cos^(2)10^(0)-cos10^(0)cos50^(@)+cos^(2)50^(@) is equal to (4)/(3)(b)(1)/(3)(c)(3)/(4)(d)3

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