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It is work very well ,, thank you very much indeed
Thank you its work well
You may try this:Z1[x_,y_]:=1; Z2[x_,y_]:=Cos[x]*Sin[y]; Plot3D[{Z1[x,y],Z2[x,y]},{x,-3,3},{y,-3,3}]
Thank you very much my dear friend, I do feel grateful to you.