Question: 3D Plotting Observation

I'm working through Francis Wright's book COMPUTING WITH MAPLE. I'm not exactly sure which version of Maple this book is based on. The book's copyright is c2002. If any responders are familiar with this title or author also let me know. I'm looking on some opinions about this person. My question is that Mr Wright in one example stated that 3D plots don't admit multiple plots in [List] format. However when I typed the input: plot3d([sin(x),sin(y)], x = -Pi..Pi, y = -Pi..Pi); I still got a plot instead an error message.
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