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man pages->FreeBSD man pages -> atanf (3)
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ATAN(3)

```
```

NAME[Toc][Back]

```     atan, atanf -- arc tangent functions of one variable
```

LIBRARY[Toc][Back]

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

SYNOPSIS[Toc][Back]

```     #include <math.h>

double
atan(double x);

float
atanf(float x);
```

DESCRIPTION[Toc][Back]

```     The atan() and the atanf() functions compute the principal value of the
arc tangent of x.	For a discussion of error due to roundoff, see
math(3).
```

RETURN VALUES[Toc][Back]

```     The atan() and the atanf() function returns the arc tangent in the range
```

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

STANDARDS[Toc][Back]

```     The atan() function conforms to ISO/IEC 9899:1990 (``ISO C89'').

FreeBSD 5.2.1			  May 2, 1991			 FreeBSD 5.2.1```
[ Back ]
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