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

The value of cos e c10^0+cos e c50^0-cos e c70^0 is ____

Find the value of cos12^0+cos84^0+cos156^0+cos132^0

The value of cos 1^@ . Cos 2^@ , cos 3^@ cos 179 ^@ is equal to

The value of sin^3 10^0+sin^3 50^0-sin^3 70^0 is equal to (a) -3/2 (b) 3/4 (c) -3/4 (d) -3/8

If cos 25^0 + sin 25^0 = p , then cos 50^0 is equal to

Show that cos10^o cos30^o cos50^o cos70^o =3/16

The value of sum_(r=0)^(10)cos^3((rpi)/3) is equal to (a) 1/4 (b) 1/8 (c) -1/4 (d) -1/8

The value of 4 sin A cos ^3 A -4 cos sin^3 A is equal to

Let x=sin1^0, then the value of the expression. 1/(cos0^0dotcos1^0)+1/(cos1^0dotcos2^0)+1/(cos2^0dotcos3^0)+1/(cos44^0dotcos45^0) is equal to (a) x (b) 1/x (c) (sqrt(2))/x (d) x/(sqrt(2))

The value of cos^(-1)sqrt(2/3)-cos^(-1)((sqrt(6)+1)/(2sqrt(3))) is equal to (A) pi/3 (B) pi/4 (C) pi/2 (D) pi/6