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MathGroup Archive 2001

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Re: Expanding Trig Power Identities

  • To: mathgroup at smc.vnet.net
  • Subject: [mg30417] Re: Expanding Trig Power Identities
  • From: "Allan Hayes" <hay at haystack.demon.co.uk>
  • Date: Fri, 17 Aug 2001 03:09:55 -0400 (EDT)
  • References: <9ld1ej$2g5$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Matthias,
It appears that TrigReduce need exact input: it works if we replace .5 in
your example with 1/2.

--
Allan
---------------------
Allan Hayes
Mathematica Training and Consulting
Leicester UK
www.haystack.demon.co.uk
hay at haystack.demon.co.uk
Voice: +44 (0)116 271 4198
Fax: +44 (0)870 164 0565

<Matthias.Bode at oppenheim.de> wrote in message
news:9ld1ej$2g5$1 at smc.vnet.net...
> Dear Colleagues,
>
> I tried Bob Hanlon's TrigReduce Table changing n from "{n, 4}" to "{n, 1,
3,
> 0.5}":
>
> Table[{y = Sin[a]*Sin[b]^n, "=", TrigReduce[y]}, {n, 1, 3, 0.5}] //
> TableForm
>
> and neither the integer nor the non-integer exponent expressions evaluated
> whereas the original example "{n, 4}" evaluates just fine. Why?
>
> Best regards,
>
> Matthias Bode
> Sal. Oppenheim jr. & Cie. KGaA
> Koenigsberger Strasse 29
> D-60487 Frankfurt am Main
> GERMANY
> Tel.: +49(0)69 71 34 53 80
> Mobile: +49(0)172 6 74 95 77
> Fax: +49(0)69 71 34 63 80
> E-mail: matthias.bode at oppenheim.de
> Internet: http://www.oppenheim.de
>
>
>
>
>
> -----Ursprungliche Nachricht-----
> Von: BobHanlon at aol.com [mailto:BobHanlon at aol.com]
> Gesendet: Sonntag, 12. August 2001 08:30
> An: mathgroup at smc.vnet.net
> Betreff:  Expanding Trig Power Identities
>
>
> Table[{y = Sin[a]*Sin[b]^n, "=", TrigReduce[y]}, {n, 4}] // TableForm
>
> Table[{y = Cos[a]*Cos[b]^n, "=", TrigReduce[y]}, {n, 4}] // TableForm
>
>
> Bob Hanlon
> Chantilly, VA  USA
>




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