# Find the limits of integration of integral in D'Alembert solution formula of the 'initial velocity function'

Can someone guide me how to take limits of integration in D'Alembert solution formula when one dimensional homogenous wave equation is given over finite interval with Neumann boundry conditions while solving with reflection method. I am completely lost. Or can you share any reference or link where entire method is explained or links where such problems have solved or discussed. Sorry for this question but my Prof haven't discussed it and I am getting too confused.I have understood how to solve when Dirichlet boundry conditions are given.