All the functions are plotted in range -2,-2 2,2
sin(x^2+y^2), vertex color, step 0.0125
cos(x^2+y^2), polygon color, step 0.1
cos(x^2+y^2), wireframe, step 0.1
cos(x^2+y^2), point rendering, step 0.1
particular of stationary point of x^2-y^2, wireframe
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