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man pages->NetBSD man pages -> acos (3)
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## ACOS(3)

```
```

### NAME[Toc][Back]

```     acos, acosf - arc cosine function
```

### LIBRARY[Toc][Back]

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

### SYNOPSIS[Toc][Back]

```     #include <math.h>

double
acos(double x);

float
acosf(float x);
```

### DESCRIPTION[Toc][Back]

```     The acos() and acosf() functions compute the principal value of the arc
cosine of x in the range [0, pi].
```

### RETURN VALUES[Toc][Back]

```     If |x|>1, acos(x) and acosf(x) set the global variable errno to EDOM.
```

```     asin(3), atan(3), atan2(3), cos(3), cosh(3), math(3), sin(3), sinh(3),
tan(3), tanh(3)
```

### STANDARDS[Toc][Back]

```     The acos() function conforms to ANSI X3.159-1989 (``ANSI C'').

BSD                               May 2, 1991                              BSD
```
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