ccos

Complex circular cosine.

SYNOPSIS:

void ccos();
cmplx z, w;

ccos(&z, &w);

DESCRIPTION:

If
     z = x + iy,

then

     w = cos x cosh y - i sin x sinh y.

ACCURACY:

                      Relative error:
arithmetic   domain     # trials      peak         rms
    DEC       -10,+10      8400       4.5e-17     1.3e-17
    IEEE      -10,+10     30000       3.8e-16     1.0e-16