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hi, i'm stuck with that homework .could someone help me pls? d2u/dt2=d2u/dx2 , 0<x<1 , t>=0, boundary conditions : u(0,t)=0=u(1,t), t>=0 initial conditions : u(x,0)=sin(pi*x) , 0<x<1 u(x,0)=0, 0<x<1