sqrt man page on Scientific

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```SQRT(3)			   Linux Programmer's Manual		       SQRT(3)

NAME
sqrt, sqrtf, sqrtl - square root function

SYNOPSIS
#include <math.h>

double sqrt(double x);
float sqrtf(float x);
long double sqrtl(long double x);

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

sqrtf(), sqrtl(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600
|| _ISOC99_SOURCE; or cc -std=c99

DESCRIPTION
The sqrt() function returns the non-negative square root of x.

RETURN VALUE
On success, these functions return the square root of x.

If x is a NaN, a NaN is returned.

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

If x is positive infinity, positive infinity is returned.

If x is less than -0, a domain error occurs, and a NaN is returned.

ERRORS
See math_error(7) for information on how to determine whether an	 error
has occurred when calling these functions.

The following errors can occur:

Domain error: x less than -0
errno  is	 set  to  EDOM.	  An  invalid floating-point exception
(FE_INVALID) is raised.

CONFORMING TO
C99, POSIX.1-2001.  The variant returning double also conforms to SVr4,
4.3BSD, C89.

cbrt(3), csqrt(3), hypot(3)

COLOPHON
This  page  is  part of release 3.22 of the Linux man-pages project.  A
description of the project, and information about reporting  bugs,  can
be found at http://www.kernel.org/doc/man-pages/.

2008-08-05			       SQRT(3)
```
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