1. The problem statement, all variables and given/known data phi(r,0)=1/rt(2)(phi1+ph2) What is phi(r,t)? 2. Relevant equations 3. The attempt at a solution Is this simply a case of introducing a phase constant to the eqn. So: phi(r,t)=1/rt(2)(phi1+phi2)e^i(theta)t or do we need to modify phi1 and phi2.