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Re: kernel problem for trigonometry

  • To: mathgroup at
  • Subject: [mg29850] Re: kernel problem for trigonometry
  • From: "Orestis Vantzos" <atelesforos at>
  • Date: Fri, 13 Jul 2001 04:19:30 -0400 (EDT)
  • Organization: National Technical University of Athens, Greece
  • References: <9ijhqn$rhr$>
  • Sender: owner-wri-mathgroup at

Well, the trig expression does not evaluate to anything by itself, unless
you use N to turn it into a real number.
By calling FullSimplify you tell Mathematica to apply trig identities in an
effort to simplify the expr. It is obvious that simple arguments like Pi, 2
Pi, Pi/2, Pi/3 etc. simplify immedaitely to algebraic expressions involving
simple roots. Not so classical arguments like 220deg do not map readily to
algebraic expr. of roots. It is obvious that there is a wide range of
possible transformation that could be applied, so it is only natural that
FullSimplify takes a lot of time to navigate through the mess of trig
"Soh Pek Hooi" <fbasohph at> wrote in message
news:9ijhqn$rhr$1 at
> Hi,
> May I find out the reason for the Kernel to compute the following with
> longer than the normal response time? It take several minutes to return a
> value, especially when the degree is not one of 0, 30, 45, 90 Degrees, and
> so on.
> FullSimplify[Sin[110 Degree]/Cos[220Degree]]
> Will appreciate your reply.
> Pek

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