# casinhf, casinh, casinhl

< c‎ | numeric‎ | complex

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Complex number arithmetic
Types and the imaginary constant
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Power and exponential functions
Trigonometric functions
Hyperbolic functions
 cacosh casinh catanh

 Defined in header `` float complex       casinhf( float complex z ); (since C99) double complex      casinh( double complex z ); (since C99) long double complex casinhl( long double complex z ); (since C99)

Computes the complex arc hyperbolic sine of `z` with branch cuts outside the interval [−i; +i] along the imaginary axis.

## Contents

### Parameters

 z - complex argument

### Return value

The complex arc hyperbolic sine of `z` in the interval (−∞; +∞) along the real axis and in the interval [−iπ/2; +iπ/2] along the imaginary axis.

### Example

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

int main(void)
{
double complex z;

z = csinh(1.0+2.0*I);
printf("csinh(1.0+2.0*I)             ==> %f%+fi\n", creal(z),cimag(z));

z = casinh(-0.489056+1.403119*I);
printf("casinh(-0.489056+1.403119*I) ==> %f%+fi\n", creal(z),cimag(z));

return 0;
}```

Output:

```csinh(1.0+2.0*I)              ==> -0.489056+1.403119i
casinh(-0.489056+1.403119i*I) ==> -1.000000+1.141593i```