Find all value of `theta`, between `0 & pi`, which satisfy the equation; `cos theta * cos 2 theta * cos 3theta = 1/4`.

Find the values of theta between 0^(@) and 360^(@) which satisfy the equation 3 cos 2 theta - sin theta = 2.

Find all the numbers between 0 and 2 pi , which satisfy the equation 2 sin^2 theta= 3 cos theta .

Find the values of theta between 0^(@) and 360^(@) which satisfy the equations cos2theta=(1)/(2) .

Find the values of theta betwen 0^(@) and 180^(@) satisying the equation cos6 theta+cos4 theta+cos2 theta+1=0

Find all the values of theta satisfying the equation cos 2 theta - cos 8 theta + cos 6 theta =1, such that 0 le theta le pi.

Find the number of all values of theta in[0,10.5] satisfying the equation cos6 theta+cos4 theta+cos2 theta+1=0

Find the general value of theta which satisfies the equation (cos theta+i sin theta)(cos2 theta+i sin2 theta)......(cos n theta+i sin n theta)=1

The number of values of theta in [0,2 pi] satisfying the equation 2sin^(2)theta=4+3cos theta are