Question: writing and calling functions in maple???

So what is the Maple equivalent of  functions/scripts?   and how do I call them?   like I have define the function f in the worksheet (in a code edit region) , but f(2)  just returns f(2)  no function evaluation.  

p.s. can someone recommend a guide on programming in maple?  Like writing and calling functions not   their standard programming guide which is long winded and not helpful.

 

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