3. A solution to the Telegraph equation, \frac{\partial^{2} E}{\partial t^{2}}+\alpha \frac{\partial E}{\partial t}-c^{2} \frac{\partial^{2} E}{\partial x^{2}}=0 can be obtained by letting E(x, t) = v(t)U(x, t) with a view to removing the first order time derivative. Use this process to obtain the Klein-Gordon equation, \frac{\partial^{2} U}{\partial t^{2}}-c^{2} \frac{\partial^{2} U}{\partial x^{2}}-\frac{\alpha^{2}}{4} U=0