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 * * * *-------------------------------------------------------*