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Question: Why this example from the Online help doesn't work?

Question:Why this example from the Online help doesn't work?

Inge88 10 Maple 13
initial-conditions
April 16 2015
0

Hello everyone!

I'm trying to understand how to work with PDEs in Maple by solving a basic PDE such as the wave equation, along with conditions at t = 0 in terms of arbitrary functions. I stumbled upon the very same example, included in the Maple Online help at this page under the part "Three Textbook Examples":

I tried to copy and paste the code and execute it, but to no avail: it seems like pdsolve doesn't give me any other result than a blank space, unlike in the example reported in the Online help. Can anyone tell me if (and where) I am doing wrong? Is it possible that my version of Maple (Maple 13) may not be compatible with the procedures required by this example?

 A warm thank you to whoever will help me!
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