Question

The expression

             

Solution

Correct option is

2 cos x

The given expression can be written as

           

          

        

SIMILAR QUESTIONS

Q1

If x = sin αy = sin βz = sin (α + β) then cos (α + β) =

Q2

The radius of the circle

 

Q3

If tan x + tan (x + π/3) + tan (x + 2π/3) = 3, then

Q4

The equation cos 2x + a sin x = 2a – 7 possesses a solution if

Q5

sin 470 + sin 610 – sin 110 – sin 250 is equal to

Q6

 

 

Q7

If 3π/4 < α < π, then  is equal to

Q8
Q9

  

 

Q10

If tan (π cos θ) = cot (π sin θ) then cos (θ – π/4) is equal to