Find the values of `theta` betwen `0 ^@` and `180^@` satisfying the equation `cos6theta+cos4theta+cos2theta+1=0`

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

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

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

1+cos2 theta+cos4 theta+cos6 theta=

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

Find all value of theta, between 0& pi, which satisfy the equation; cos theta*cos2 theta*cos3 theta=(1)/(4)

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 values of theta between 0^(@) and 360^(@) that satisfy the equation sin ( theta + 30^(@)) = 2 cos (45^(@) + theta )

1+ cos 2 theta + cos 4 theta + cos 6 theta =

Find the value of theta (0^@ le theta le 90^@) satisfying : 2 sin^2 theta= 3 cos theta .