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

The value of cot70^0+4cos70^0 is

The value of cos^2 10^0-cos10^0cos50^0+cos^2 50^0 is equal to

If cosx=tany ,cosy=tanz ,cosz=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 cos20^0cos40^0cos60^0cos80^0=1/(16)dot

If |{:(1,cos alpha, cos beta),(cos alpha, 1 , cos gamma ),(cos beta, cos gamma , 1):}|=|{:(0,cos alpha, cos beta),(cos alpha , 0 , cos gamma),(cos beta, cos gamma, 0):}| then the value of cos^2 alpha + cos^2 beta + cos^2 gamma is : (a) 1 (b) 1/2 (c) 3/8 (d) 9/4

Write 'true' or 'false': The value of cos 0^(@) xx cos 1^(@) xx cos2^(@) xx cos3^(@) xx ….. xx cos90^(@) is 1.

The value of sin^(-1)(sin12)+cos^(-1)(cos12)=

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

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))