Extremum graphing question

[lrdheat]

On a graph of abs(cos X), is there a way for the graphing app function analysis to recognize minimum extremums? The app only recognizes maximums...seems to have difficulty with such a function defined at all X values that have a clear minimum f(X), but no defined f'(X) at those points.

Is it possible for the graphing app to be designed to find these extremums?