2269 – D BUG: cosine of complex

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

Fixed dmd 1.034 and 2.018

Same problem exists in Tango. Fixed in Tango commit #3878