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Identities for atan(a+b) or atan(a*b)

  1. Aug 12, 2011 #1

    rhz

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    Hi,

    Does anyone know of any nice identities for the inverse or arc tangent of a sum or a product?

    Thanks,

    rhz
     
  2. jcsd
  3. Aug 16, 2011 #2

    rhz

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    bump...

    Any ideas out there? I searched for this on google and came up with nothing.

    Thanks!
     
  4. Aug 17, 2011 #3

    Mentallic

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    Homework Helper

    I don't believe there are any nice expansions for the sum or product of inverse trigs, such as how there are for trigs. What do you need them for exactly?
     
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