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How can i plot such a graph like this?

I mean placing the 3d plot and the contour in the same figure enter image description here

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As @Louis pointed in the comment get this done just by combining Plot3D and SliceContourPlot3D if you are having post 10.2 MMA.

fun[x_, y_] := Sin[x + y] Cos[x - y];
Show[Plot3D[fun[x, y], {x, -2, 2}, {y, -2, 3}, Mesh -> None, 
  PlotStyle -> Directive[Opacity[0.75], Specularity[White, 50]], 
  ColorFunction -> "Rainbow", PlotTheme -> "Detailed", 
  FaceGrids -> None], 
 SliceContourPlot3D[fun[x, y], 
  z == -1, {x, -2, 2}, {y, -2, 3}, {z, -1, 1}, 
  ColorFunction -> "Rainbow", Boxed -> False]]

enter image description here

You can control the vertical position by setting suitable value for z. Note that I have used z=-1 in SliceContourPlot3D.

In case you want to avoid SliceContourPlot3D you can resort to the answers here.

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