### Programming Reference/Librarys

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c:complex.h:catanh

# catanh

`double complex catanh(double complex z);`

### description of catanh

calculate the complex arc hyperbolic tangent

```#include <stdio.h>
#include <complex.h>

int main( void )
{

long double complex zlong=4.2 + I*2.34;
double complex zdouble=(double complex)zlong;

double result;

result = catanh(zdouble);
printf("catanh(%f + I*%f) = %f\n", creal(zdouble), cimag(zdouble), result);
return 0;
}```

## output of catanh c example

`  catanh(4.200000 + I*2.340000) = 0.181767`

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