1. The problem statement, all variables and given/known data I've been given two wave equations: y1 = 5/(kx − ωt)2 + 2 y2 = −5/(kx + ωt − 6)2 + 2 and I am to find first the instantaneous time at which they cancel, and then the position at wich the pulses always cancel. 2. Relevant equations This is the wave form equation, and it is already in that form. It seems more a matter of finding a method to deduce t and x, rather than by using equations. 3. The attempt at a solution I've tried plugging in some values to see what exactly changes, and then used that information to decide how exactly to find the values, but to no avail. No web pages seem to have information relevant to this type of question.