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

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SUMMARY

The discussion centers on the lack of established identities for the inverse tangent function, specifically for the expressions atan(a+b) and atan(a*b). Participants confirm that, unlike trigonometric functions, there are no known elegant expansions for the sum or product of inverse trigonometric functions. The inquiry highlights a gap in available mathematical tools for simplifying these expressions.

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  • Understanding of inverse trigonometric functions
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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
 
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Any ideas out there? I searched for this on google and came up with nothing.

Thanks!
 
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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