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

Find the value of cos 12^(@)+cos 84^(@)+cos 156^(@)+cos 132^(@)

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

If cosx=tany ,coty=tanz ,cotz=tanx , then the value of sinx is (a) 2cos18^0 (b) cos18^0 (c) sin18^0 (d) 2sin18^0

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

Prove that cos55^0+cos65^0+cos175^0=0

Find the sign of the values of tan113^0-cos107^0=a and tan107^0-cos105^0=b

Which of the following number(s) is/are rational? (a) sin15^0 (b) cos15^0 (c) sin15^0cos15^0 (d) sin15^0cos75^0

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))