For example, for function SUBST, we find the following CAS help facility
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:
At this point, select function TEXPAND from menu ALG (or directly from
the catalog ‚N), to complete the operation.
Operations with transcendental functions
The calculator offers a number of functions that can be used to replace
expressions containing logarithmic and exponential functions („Ð),
as well as trigonometric functions (‚Ñ).
Expansion and factoring using log-exp functions
The „Ð produces the following menu: