#4806 Taylor: bad singular datum

[David Scherfgen]

exp(-(taylor(x,x,inf,2)-a)^2) - exp(-(taylor(x,x,inf,2)+a)^2);

Is a positive, negative or zero?
zero;

debugger invoked on a SIMPLE-CONDITION in thread
#<THREAD tid=10260 "main thread" RUNNING {1103FD0083}>:
  bad singular datum