Plot derivative of a function

[Onkel Otto]

Hi :-),

while playing around with the Prime and compairing it with Nspire CX CAS, Classpad 300,
Ti-92 ... and some others, I observed a strange behaviour.

When using options from the "Fcn"-Menue in Plot (e.g. "Signed area.." or "Intersection", Pic1)

   

which take reference to other functions defined, the function name in the referenced function
is renamed from original name (Pic2: F3(X) = dF2/X)/dX=X)

   

to "F1(X)" (Pic3 and Pic4).
   
   

This behaviour is reproduceable and occures with the virtual and with the real Prime.
Once the "F2(X)"-String was replaced by some chinese symbols (not reproduceable).
An other time the real Prime was instantly rebooting when I tried to apply "Tangent"
to function #2 or #3.
The plotted graph allways keeps fine unless you open and save the modified function.

Best greetings
Klaus,
... who likes the Prime more and more :-)