Groups > comp.soft-sys.math.mathematica > #1669

Trignometric rules

From	Chelly <chelly85086@gmail.com>
Newsgroups	comp.soft-sys.math.mathematica
Subject	Trignometric rules
Date	2011-04-14 09:00 +0000
Organization	Steven M. Christensen and Associates, Inc and MathTensor, Inc.
Message-ID	<io6d3h$drj$1@smc.vnet.net> (permalink)

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I have an expression as hsown below

tt = -4 k1^2 v^2 \[Epsilon]1^2 \[Epsilon]c^2 Cos[2 d1 + d2 + d3] - 
   2 k1 k2 u^2 \[Epsilon]1 Cos[d1 + d2 - \[Phi]b - \[Phi]r] + 
   2 k1^2 v^2 \[Epsilon]1^2 \[Epsilon]c^2 Cos[
     2 d1 + d2 + d3 - \[Phi]b - \[Phi]r] + 
   2 k1^3 k2 v^2 \[Epsilon]1^3 \[Epsilon]c^2 Cos[
     d1 + d3 + \[Phi]b + \[Phi]r] + 
   2 k1^2 u^2 \[Epsilon]1^2 Cos[2 d1 + d2 + d3 + \[Phi]b + \[Phi]r] - 
   2 k1^2 v^2 \[Epsilon]1^2 \[Epsilon]c^2 Cos[
     2 d1 + d2 + d3 + \[Phi]b + \[Phi]r];

I'd like to replace any term containing Cos[+/- phib + x_]  with 2 Sin [+/-phib] Sin[x]. How do I go about doing it.

Thanks
Chelly

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Trignometric rules Chelly <chelly85086@gmail.com> - 2011-04-14 09:00 +0000
  Re: Trignometric rules Peter Pein <petsie@dordos.net> - 2011-04-15 07:56 +0000
    Re: Trignometric rules Peter Pein <petsie@dordos.net> - 2011-04-16 11:34 +0000

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