It is a 1-D wave equation problem with fixed ends, no initial velocity, and initial displacement of [tex]2sin(\pi x)[/tex] on the interval 0<x<4, t>0. See my attached documents of my work. I end up with a c_n value of 0 based on the integration. I am pretty confident I set up the problem correctly as it follows a similar, generalized problem in my class notes. Obviously I used actual numbers in this problem. Can anyone spot any errors in my work? Thanks for your help.