Derivatives on HP 42S

[Thomas Klemm]

I've inlined the function:

Code:

LBL "dF"
MVAR "x"
MVAR "h"
RCL "x"
RCL "h"
COMPLEX
SIN
LASTX
÷
COMPLEX
END

Set MODES to RAD.
Start SOLVER.
Select Solve Program: dF
Set small value h: 1E-5 h
Set lower guess: π x
Set upper guess: π 2 × x
Solve for x: x

x=4.49341

Kind regards
Thomas

PS: Link to original post