The calculator ClassPAD400 (fx-cp400) has a step by step mode (assist), away to emulate this feature is "trick" on HP-Prime rename the functions
f => f(x)
sample:
automatically and internally could do the same for the HP-Prime
/!\ but the mode assist fx-cp400 not always work =(
Edited: 2 Sept 2013, 9:22 a.m.