/* gcc asin.c
 * expected output: asin(2) = 1.5708 +1.3170i
 * output on musl:  asin(2) = -1.3170 +1.5708i
 */
#include <stdio.h>
#include <complex.h>

int main() {
  double complex arg = 2;
  double complex res = casin(arg);
  printf("asin(2) = %.4lf %+.4lfi\n", creal(res), cimag(res));
}