Smallest positive x satisfying the equation ` cos^(3) 3x + cos^(3) 5x = 8 cos^(3) 4x * cos^(3) x ` is :

Samllest positive angle satisfying the equation cos^(2)x+cos^(2) 2x+cos^(2)3x=1 , is

Smallest positive x satisfying the equation sin3x+3cos x=2sin2x(sin x+cos x), is-

Number of values of x satisfying the equation cos(4pi/3-cos^-1x)=x is

If the equation cos 3 x cos^(3) x + sin 3 x sin^(3) x =0 , then x is equal to

If x is smallest positive angle in degrees satisfying the equation 8sin x cos^(5)x8sin^(5)x cos x=1, then find the value of 2x .

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

Smallest positive angle satisfying the equation 4log_(16)(cos2x)+2log_(4)(sin x)+log_(2)(cos x)+3=0 is