catanh man page on SmartOS

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```catanh(3M)		Mathematical Library Functions		    catanh(3M)

NAME
catanh, catanhf, catanhl - complex arc hyperbolic tangent functions

SYNOPSIS
c99 [ flag... ] file... -lm [ library... ]
#include <complex.h>

double complex catanh(double complex z);

float complex catanhf(float complex z);

long double complex catanhl(long double complex z);

DESCRIPTION
These  functions	 compute the complex arc hyperbolic tangent of z, with
branch cuts outside the interval [ −1, +1 ] along the real axis.

RETURN VALUES
These functions return the complex arc hyperbolic tangent value, in the
range  of  a  strip mathematically unbounded along the real axis and in
the interval [ −ipi/2, +ipi/2 ] along the imaginary axis.

ERRORS
No errors are defined.

ATTRIBUTES
See attributes(5) for descriptions of the following attributes:

┌─────────────────────────────┬─────────────────────────────┐
│      ATTRIBUTE TYPE	     │	    ATTRIBUTE VALUE	   │
├─────────────────────────────┼─────────────────────────────┤
│Interface Stability	     │Standard			   │
├─────────────────────────────┼─────────────────────────────┤
│MT-Level		     │MT-Safe			   │
└─────────────────────────────┴─────────────────────────────┘

SunOS 5.11			  12 Jul 2006			    catanh(3M)
```
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