The Museum of HP Calculators
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The answer is:
For the program, uses two labels.
LBL D: Derivative in a point
LBL F: Function f(X)
Find the derivative of X3+4*X2+X-6 in X=3 whit the HP-35s.
XEQ D [ENTER]
A? 3 [R/S]
F001 LBL F F002 X3+4*X2+X-6 F003 RTN D001 LBL D D002 INPUT A D003 STO X D003 XEQ F001 D004 x⇔y D005 0.000001 D006 + D008 STO X D009 XEQ F001 D010 x⇔y D011 Clx D012 R↓ D013 - D014 0.000001 D015 ÷ D016 +/- D017 RTN