github.com/afumu/libc@v0.0.6/musl/src/complex/ccos.c (about)

     1  #include "complex_impl.h"
     2  
     3  /* cos(z) = cosh(i z) */
     4  
     5  double complex ccos(double complex z)
     6  {
     7  	return ccosh(CMPLX(-cimag(z), creal(z)));
     8  }