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# 7.4.1 f(x,y) = x^2+y -2 f(0.5,0.5) plot3d(f,(x,0.4,.6),(y,0.4,0.6)) + point3d([0.5,0.5,-1.25], size = 20, color = "red") # Yep, curved surface looks like plane when you zoom in!
-1.25000000000000
3D rendering not yet implemented
# 7.4.3 # cutting plane for Y = 2 intersecting surface Z = X^2/2 - Y^2/4 - 4 # Z = X^2/2 - 2^2/4 - 4 = X^2/2 - 1 - 4 = X^2/2 - 5 var("X") plot(X^2/2 - 5,(X,-2,2), axes_labels = ["X","Z"])
X