int(32*h*((x/l)^4-2*(x/l)^3+x/l)*sin(Pi*n*x/l)/(5*l), x = 0 .. l)int(32*h*((x/l)^4-2*(x/l)^3+x/l)*sin(Pi*n*x/l)/(5*l), x = 0 .. l)

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