Graph of derivative (Function app)

08022018, 12:11 PM
Post: #1




Graph of derivative (Function app)
Hello,
why does the app not find an extremum? Here is what I entered: In symb view: F1(X)= x*(x3)*(x+4) F2(x)= d F1(X)/d(X) (On the calc I used the template for the partial derivative) In plot view the graphs of F1 and F2 are displayed. Using the menu and Fcn I analyze the graph of F1. The app finds roots and extrema (ok). Then I put the cursor on the graph of F2 (parabola). Now the app finds the roots but not the extremum (minimum in this case) (not ok) . The roots are no problem (ok). For a test I changed F2 to F2(X) = (X+1)^2 to mimic the parabola  this time the app is successful and finds the maximum and the roots. (ok). So  is there a problem with a function defined in terms of a derivative? Thomas (P.S. I am using the latest firmware) 

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