HP 49g+ - Manual (Page 83)

Page 5-5
Copy the examples provided onto your stack by pressing @ECHO!. For example,
for the EXPAND entry shown above, press the @ECHO! soft menu key to get the
following example copied to the stack (press ` to execute the command):
Thus, we leave for the user to explore the applications of the functions in the
ALG (or ALGB) menu. This is a list of the commands:
For example, for function SUBST, we find the following CAS help facility
entry:
Note: Recall that, to use these, or any other functions in the RPN mode,
you must enter the argument first, and then the function. For example, the
example for TEXPAND, in RPN mode will be set up as:
³„¸+~x+~y`
At this point, select function TEXPAND from menu ALG (or directly from
the catalog
‚N), to complete the operation.