1#include "complex_impl.h"
2
3// FIXME
4
5/* asin(z) = -i log(i z + sqrt(1 - z*z)) */
6
7double complex casin(double complex z)
8{
9 double complex w;
10 double x, y;
11
12 x = creal(z);
13 y = cimag(z);
14 w = CMPLX(1.0 - (x - y)*(x + y), -2.0*x*y);
15 double complex r = clog(CMPLX(-y, x) + csqrt(w));
16 return CMPLX(cimag(r), -creal(r));
17}