[Date Index] [Thread Index] [Author Index]

Automatic Evaluation of Sec[z]

• To: mathgroup at yoda.physics.unc.edu
• Subject: Automatic Evaluation of Sec[z]
• From: Anders Christensen <ac at sl.dth.dk>
• Date: Wed, 5 Jan 94 10:28:39 MET

Hi Mathematica developers -

My problem might be mostly for the folks at WRI: In Denmark, it is most uncommon 
to use the function Sec[z] for computation in geometry. (until now I have 
never used it, neither in my education nor in my professional work). My students 
and I therefore often get quite confused when we do trigonometric modelling with 
Mathematica: we expect 1/Cos[z], but Mathematica automatically evaluates to 
Sec[z]. Is there any way, without disabling the rest of the trigonometric 
simplification rules, to prevent this evaluation and keep the 1/Cos[z], and how?

Happy new year,
Yours,

ANDERS CHRISTENSEN


--
*-------------------------------------------------------*
*                                                       *
*       ANDERS CHRISTENSEN                              *
*       M.Sc.E.E. Ph.D. , Assoc. Prof.                  *
*       Institute Of Automatic Control Systems          *
*       Technical University of Denmark, Bldg. 326      *
*       DK-2800 Lyngby, Denmark                         *
*       Tel. +45 42 88 01 99 ext 3559 (operated)        *
*         or +45 45 93 12 22 ext 3559 (direct)          *
*       fax  +45 42 88 12 95                            *
*       e-mail ac at sl.dth.dk                             *
*                                                       *
*-------------------------------------------------------*