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y(x,t) = [Ccos (nctpi/L) + Dsin(nctpi/L)]sin(nxpi/L)

However, in the final solution, there is no cosine term, (even though C exists and D is zero). Where did it go to? Can someone please give me a quick run-down on this because I'm just baffled right now. In the final eqt we mulitply C by sin(nctpi/L)sin(nxpi/c)

I get how to calculate the C term okay. It's just the diappearence of the cosine term that has me confused. The question that we're given for our homework is the same as there's no cosine term in that answer either. What am I doing wrong?