[seqfan] were there errors in cosec back in 1996 ?

[N. J. A. Sloane]

Dear Seq Fans, Still trying to guess what went wrong
with Patrick Demichel's sequences - one possibility is that
there were errors in Maple (or Mathematica) in the
cosec and other trig and inverse trig functions
back in 1996. That is, if one did
series(csc(x),x,20);
in Maple back in 1996, one got an incorrect answer.
Not very likely, of course, but not
impossible. Does anyone remember?
Neil