# Is it possible to plot a function using Plot3D and a curve using ParametricPlot3D in the same picture?

I'd like to plot a graph of a function using e.g. Plot3D and then a line (in general a curve, in my case a straight line, tangent at some point to the surface just drawn), using e.g. ParametricPlot3D in the same picture. Is it possible? If yes, how?

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Try using Show[] for this. Eg:
Show[