csin.c\complex\src - musl - musl - an implementation of the standard library for Linux-based systems

#include "complex_impl.h"
/* sin(z) = -i sinh(i z) */
double complex csin(double complex z)
{
	z = csinh(CMPLX(-cimag(z), creal(z)));
	return CMPLX(cimag(z), -creal(z));
}