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The following form allows you to view linux man pages.

 Command:

atan2l

```

```

SYNOPSIS

```       #include <math.h>

double atan2(double y, double x);
float atan2f(float y, float x);
long double atan2l(long double y, long double x);

Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

atan2f(), atan2l():
_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 ||
_ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L;
or cc -std=c99

```

DESCRIPTION

```       The atan2() function calculates the principal value of the arc  tangent
of  y/x, using the signs of the two arguments to determine the quadrant
of the result.

```

RETURN VALUE

```       On success, these functions return the principal value of the arc  tan-
gent of y/x in radians; the return value is in the range [-pi, pi].

If y is +0 (-0) and x is less than 0, +pi (-pi) is returned.

If y is +0 (-0) and x is greater than 0, +0 (-0) is returned.

If y is less than 0 and x is +0 or -0, -pi/2 is returned.

If y is greater than 0 and x is +0 or -0, pi/2 is returned.

If either x or y is NaN, a NaN is returned.

If y is +0 (-0) and x is -0, +pi (-pi) is returned.

If y is +0 (-0) and x is +0, +0 (-0) is returned.

If  y is a finite value greater (less) than 0, and x is negative infin-
ity, +pi (-pi) is returned.

If y is a finite value greater (less) than 0, and x is positive  infin-
ity, +0 (-0) is returned.

If  y  is  positive infinity (negative infinity), and x is finite, pi/2
(-pi/2) is returned.

If y is positive infinity (negative infinity) and x is negative  infin-
ity, +3*pi/4 (-3*pi/4) is returned.

If  y is positive infinity (negative infinity) and x is positive infin-
2010-09-20                          ATAN2(3)
```
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