[Issue 2269] New: D BUG: cosine of complex

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=2269

           Summary: D BUG: cosine of complex
           Product: D
           Version: unspecified
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Phobos
        AssignedTo: bugzilla at digitalmars.com
        ReportedBy: bugzilla at digitalmars.com


I am doing some programming in D and
I dicovered that cos(z), where z is a
complex number, is computed incorrectly.
After looking at the documentation, D
uses the equation:

cos(z) = cos(z.re)*cosh(z.im) + sin(z.re)*sinh(z.im)i

The correct equation is actually the complex conjugate
of the above equation:

cos(z) = cos(z.re)*cosh(z.im) - sin(z.re)*sinh(z.im)i


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