Question: Help please

I have an application for wave temperature propagation in soil: with (plots); > u(x,t):=A*exp(-sqrt(w/(2*a^(2)))*x)*cos(-sqrt(w/(2*a^(2)))*x+w*t); > w:=10; > A:=4; > a:= 4*10^(-3); >plot3d(u(x, t), x = 0 .. 10, t = 0 .. 10); It is for x = 0. How can I do for x>0? Thanks, Raluca

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