Complex arg-trig functions

[Stephen Montgomery-Smith]

I just found out that the boost libraries implement the complex asin 
function.  I think their implementation is more faithful to the paper by 
Hull et al than my implementation is.  It does seem to have a BSD style 
license.  The only problem with it is that it is written in C++.

http://www.boost.org/doc/libs/1_43_0/boost/math/complex/asin.hpp