Dumb piloting question

[cyrille de brébisson]

Hello,

The best way is to use the CAS as described above. you can even simplify by doing F2:=F1'

This is best because it is the least amount of work and because the calculation of the function for drawing will be very fast...

Else, you can enter F2 as
d(F1(X))/d(X=X)
where d is the derivative symbol (use the template in the template key)....

I know that it might look strange at first, but you need to realize that the evaluation of d(F1(X))/d(X) is a FUNCTION, not a number! hence, if you were using this as a definition of F2, in every point, F2 would evaluate to a function and not to a number.
in fact, the X in the F1(X) and the first X are NOT the same as the X on the right side of the = sign... that X is the X that the function is evaluated for, the other is the derivative variable.

Best would be to enter d(F1(A))/d(A=X) or something like that, but this is more keys :-)

note, that this solution is slower as the derivation has to be performed for every point!

Cyrille