Extremum Graphical Fails

[essen]

(03-12-2021 03:22 AM)lrdheat Wrote:  I notice that the Prime comes up with a “No minimum or maximum found” on a number of functions in the graph app.

An example is the graph of d/dx (COS (X)/(1+(SIN(x))^2).

I’m wondering why this is the case...

Set angle mode to radians. Then it will, at least something of it.

Should be:
Y=1 for X=0+2*pi*n (n=integer, plus or minus).
Y=-1 for X=-pi+2*pi*n (n=integer, plus or minus).
- ?

Not the only error. It' s not possible to correct errors on this calculator. As it were build with a mistaken coding language paradigm. Its memory separation has confused the creators themself. It was also a serious mistake not to use aprostrophized variables, instead of stringing. All but a few command function does not work if variables are apostrophized. The stringing gives unsolvable problems with purging and storing and handling lists holding variables not stringed, as these variables will evaluate at any action on them. Stringing them as required in this abnormal language, are not compatible with what stringing are for in programming.

Nobody of the people who keeps favoring this calculator has ever made any
serious programming running on it. Otherwise they would had known.

Manufacturers of such defective pieces should be proceeded against, when not
being honest about it, trying to hide it.