Why do we have sin/dsin/csin/zsin, but not e.g. zsinh or csinh ?

[Steve Kargl]

On Sun, Sep 20, 2009 at 01:25:39PM -0400, Kaveh R. GHAZI wrote:
> I noticed that gfortran has builtins for sin, dsin, csin and zsin in
> intrinsic.c. But we only have sinh and dsinh for the hyperbolic variant,
> no zsinh or csinh.  The cosh, tanh and tan functions follow a similar
> pattern.
> 
> I'm not sure what all the variations are for, but why the difference?
> Should I fill in the missing bits?
> 

Whoops, I forgot to answer the 2nd question in my previous 
reply.  "Should I fill in the missing bits?"  No.
-- 
Steve