src/complex/ctan.c

   1 #include "complex_impl.h"
   2
   3 /* tan(z) = -i tanh(i z) */
   4
   5 double complex ctan(double complex z)
   6 {
   7         z = ctanh(CMPLX(-cimag(z), creal(z)));
   8         return CMPLX(cimag(z), -creal(z));
   9 }