Prove that cos 3theta /cos theta + sin 3theta/ sin theta= 4 cos 2 theta
You asked:
Prove or disprove that the equation $\frac{\cos{\left(3 θ \right)}}{\cos{\left(θ \right)}} + \frac{\sin{\left(3 θ \right)}}{\sin{\left(θ \right)}} = 4 \cos{\left(2 \right)} θ$ is an identity.