Find the number of value of x in `[0,5pi]` satisying the equation ` 3 cos^2 x -10 cos x +7=0`

Find the number of value of x in [0,5pi] satisfying the equation 3 cos2x -10 cos x +7=0

The number of values of x in [0,5 pi] satisfying the equation 3cos^(2)x-10cos x+7=0

The number of values of x in [0, 5 pi] satisfying the equation 3"cos" 2x -10 "cos" x+7=0 , is

The number of values of x in [0,2pi] satisfying the equation 3cos2x-10cosx+7=0 is

Find the number of values of x in the internal [ 0, 5 pi] satisfying the equation 3 sin^(2) x - 7 sin x + 2 = 0

The number of values of x in the interval [0,3 pi] satisfying the equation cos^(2)x+2cos x-2=0 is

The total no. of solution of x in [0, 5pi] satisfy the equation 3(cos 2x) – 10 cos x + 7 = 0 is :-

If 0 le x le 2pi , then the number of real values of x, which satisfy the equation cos x + cos 2x + cos 3x + cos 4x=0 , is