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

```
```

### NAME[Toc][Back]

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

### SYNOPSIS[Toc][Back]

```     #include <math.h>

double
acosh(double x);

float
acoshf(float x);
```

### DESCRIPTION[Toc][Back]

```     The acosh() function computes the inverse hyperbolic  cosine
of the real
argument  x.   The  acoshf()  function is a single precision
version of
acosh().
```

### RETURN VALUES[Toc][Back]

```     If x is less than one, acosh(x) and acoshf(x) return NaN and
set the
global variable errno to EDOM.
```

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

### HISTORY[Toc][Back]

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

OpenBSD      3.6                            May      6,      1991
```
[ Back ]
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