Re: TrigExpand

*To*: mathgroup at smc.vnet.net*Subject*: [mg32483] Re: TrigExpand*From*: Detlef Mueller <dmueller at mathematik.uni-kassel.de>*Date*: Wed, 23 Jan 2002 00:59:59 -0500 (EST)*Organization*: University of Kassel - Germany*References*: <a2b41r$li6$1@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

Dave Snead wrote: ... > TrigExpand[y+Cos[x]^2] > returns > 1/2 + y + Cos[x]^2/2 - Sin[x]^2/2 Really a strange Result (1 for y does leave Cos[...] alone again). Another Question: Using trigonometric Functions, I like to restrict to Sin, Cos, eventually Tan. I find Objects like Sec, Csc ... very unnecessary, ugly and contraintuitive (as they hide correlations and require to memorize them, not really making anything more easy). Can one forbid Mathematical the use of these (imo antiquated) Notations? Greeting Detlef