Question
If 0≤x<2π, then the number of real values of x, which satisfy the equation cosx+cos2x+cos3x+cos4x=0, is :
-
3
-
5
-
7
-
9
Solution
C.
7
If 0≤x<2π, then the number of real values of x, which satisfy the equation cosx+cos2x+cos3x+cos4x=0, is :
3
5
7
9
C.
7
Mock Test Series
