How can I graph equation?

Question:How can I graph equation?

Posted: st0812 15 Product: Maple

December 07 2017

u:=(x,t)->Sum(sin(r*Pi*x/20)*(4/(r^2*Pi^2))*sin(r*pi/2)*cos(r*Pi*t/20),r=1...1000);

plot3d(u(x,t),x=0...10,t=0...1);

When I want to draw the graph, it gives a straight line. But this is a wave equation

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