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Questions on the manipulation of List objects in Mathematica, and the functions used for these manipulations.

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3D plot not working, find max/min points [closed]

Im trying to plot this graph in mathematica: (x+y)sin(x-y) And this is my in- and output: Plot3D[(x + y) (Sin[x - y]), {x, -50, 50}, {y, -50, 50}] The output is this: My goal is to find how many max …