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Re: ComplexExpand and FontSize

  • To: mathgroup at
  • Subject: [mg9159] Re: ComplexExpand and FontSize
  • From: Paul Abbott <paul at>
  • Date: Thu, 16 Oct 1997 03:38:00 -0400
  • Organization: University of Western Australia
  • Sender: owner-wri-mathgroup at


>         After seeing some of the questions in the news group I have one about
> the Simplify command.  It doesn't seem to know DeMoivre's theorem.  For example
> in trying to work with Spherical Harmonics you often want the Sin and Cos
> combinations of a +/- pair but you cannot get this without typing it in.

I think you are looking for ComplexExpand, e.g.,

In[1]:= SphericalHarmonicY[2, -1, t, p]

		1                 15
		- Exp[-I p] Sqrt[----] Cos[t] Sin[t]
		2                2 Pi

In[2]:= ComplexExpand[%]

		1       15
		- Sqrt[----] Cos[p] Cos[t] Sin[t] - 
		2      2 Pi
		  1         15
		  - I Sqrt[----] Cos[t] Sin[p] Sin[t]
		  2        2 Pi

>         I have a second question about the Notebook font size.  I would like to
> change it but dont know the file.  I have looked in 3.0 book and in the 2.2
> Front End manual but neither seems to mention it.

There are many ways.  To change all cells in a Notebook, it is best to
edit the StyleSheet (under the Format menu).  Alternatively, you might
change the screen magnification or use Format/Screen Style


Paul Abbott                                   Phone: +61-8-9380-2734
Department of Physics                           Fax: +61-8-9380-1014
The University of Western Australia            Nedlands WA  6907       
mailto:paul at  AUSTRALIA                   

            God IS a weakly left-handed dice player

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