BugFix: functions confused with exponent

2 Aug 2021

      Dear All,

	Currently the following code in GiNaC

realsymbol x("x");
cout << (cos(x)/exp(x)).normal() << endl;

  prints value 1 with probability 50% (and the unmodified expression
  otherwise). I am attaching a one-line patch to fix this silly bug.

  Also I am attaching a previous patch which was not commented so
  far. The new method may be helpful from time to time but its
  equivalent in a user code would be much more involved due to the
  private nature of the relation class members.

  Best wishes,
  Vladimir
-- 
Vladimir V. Kisil                 http://www.maths.leeds.ac.uk/~kisilv/
  Book:      Geometry of Mobius Maps       https://doi.org/10.1142/p835
  Soft:      Geometry of cycles         http://moebinv.sourceforge.net/
  Jupyter notebooks:       https://github.com/vvkisil/MoebInv-notebooks

Vladimir V. Kisil

Richard B. Kreckel

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