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casin
Complex circular arc sine.SYNOPSIS:
void casin();
cmplx z, w;
casin(&z, &w);
DESCRIPTION:
Inverse complex sine:
2
w = -i clog(iz + csqrt(1 - z )).
ACCURACY:
Relative error:
arithmetic domain # trials peak rms
DEC -10,+10 10100 2.1e-15 3.4e-16
IEEE -10,+10 30000 2.2e-14 2.7e-15
Larger relative error can be observed for z near zero. Also tested by csin(casin(z)) = z.