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man pages->FreeBSD man pages -> acosh (3)
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## ACOSH(3)

```
```

### NAME[Toc][Back]

```     acosh, acoshf -- inverse hyperbolic cosine functions
```

### LIBRARY[Toc][Back]

```     Math Library (libm, -lm)
```

### SYNOPSIS[Toc][Back]

```     #include <math.h>

double
acosh(double x);

float
acoshf(float x);
```

### DESCRIPTION[Toc][Back]

```     The acosh() and the acoshf() functions compute the inverse hyperbolic
cosine of the real argument x.  For a discussion of error due to roundoff,
see math(3).
```

### RETURN VALUES[Toc][Back]

```     The acosh() and the acoshf() functions return the inverse hyperbolic
cosine of x.  On the VAX and Tahoe, if the argument is less than one
acosh() sets the global variable errno to EDOM and causes a reserved operand
fault.
```

```     asinh(3), atanh(3), exp(3), math(3)
```

### HISTORY[Toc][Back]

```     The acosh() function appeared in 4.3BSD.

FreeBSD 5.2.1			  May 6, 1991			 FreeBSD 5.2.1```
[ Back ]
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