Calculates the inverse hyperbolic cosine of a number

include <complex.h>
double complex casinh ( double complex z  );
float complex casinhf ( float complex z  );
long double complex casinhl ( long double complex z  );

The casinh( ) functions return the complex number whose hyperbolic sine is equal to their argument z.

Example

double complex v, w, z ;
double a = 0.0, b = 0.0;

puts("Enter the real and imaginary parts of a complex number:");
if ( scanf("%lf %lf", &a, &b) == 2)
{
  z = a + b * I;
  printf( "z = %.2f %+.2f*I.\n", creal(z), cimag(z) );

  v = casin(z);
  w = casinh(z);
  printf( "z is the sine of %.2f %+.2f*I\n",  creal(v), cimag(v) );
  printf( "and the hyperbolic sine of %.2f %+.2f*I.\n",
          creal(w), cimag(w) );
}
else
  printf("Invalid input. \n");

See Also

cacosh( ), catanh( ), ccosh( ), csinh( ), ctanh( ); the hyperbolic trigonometry functions for real numbers: acosh( ), atanh( ), sinh( ), cosh( ), and tanh( ); the hyperbolic cosine and inverse hyperbolic sine functions for complex numbers: csinh( ) and casinh( )