Find all the angles θ between -π to π that satisfy the equation 5 cos 2θ + 2 cos^2 θ/2 + 1 = 0?
The given answer includes + or - π/6, π - cos^-1 3/5 and -π + cos ^-1 3/5.
My own answers are not matching. Please help!
Find all the angles θ between -π to π that satisfy the equation 5 cos 2θ + 2 cos^2 θ/2 + 1 = 0?
The given answer includes + or - π/6, π - cos^-1 3/5 and -π + cos ^-1 3/5.
My own answers are not matching. Please help!