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man pages->NetBSD man pages -> asinf (3)
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## ASIN(3)

```
```

### NAME[Toc][Back]

```     asin, asinf - arc sine function
```

### LIBRARY[Toc][Back]

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

### SYNOPSIS[Toc][Back]

```     #include <math.h>

double
asin(double x);

float
asinf(float x);
```

### DESCRIPTION[Toc][Back]

```     The asin() and asinf() functions compute the principal value of the arc
sine of x in the range [-pi/2, +pi/2].
```

### RETURN VALUES[Toc][Back]

```     If |x|>1, asin(x) and asinf(x) return NaN and set the global variable
errno to EDOM.
```

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

### STANDARDS[Toc][Back]

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

BSD                               May 2, 1991                              BSD
```
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