freebsd man page for sqrt

SQRT(3) 						   BSD Library Functions Manual 						   SQRT(3)

NAME
     cbrt, cbrtf, cbrtl, sqrt, sqrtf, sqrtl -- cube root and square root functions

LIBRARY
     Math Library (libm, -lm)

SYNOPSIS
     #include <math.h>

     double
     cbrt(double x);

     float
     cbrtf(float x);

     long double
     cbrtl(long double x);

     double
     sqrt(double x);

     float
     sqrtf(float x);

     long double
     sqrtl(long double x);

DESCRIPTION
     The cbrt(), cbrtf(), and cbrtl() functions compute the cube root of x.

     The sqrt(), sqrtf(), and sqrtl() functions compute the non-negative square root of x.

RETURN VALUES
     The cbrt(), cbrtf(), and cbrtl() functions return the requested cube root.  The sqrt(), sqrtf(), and sqrtl() functions return the requested
     square root unless an error occurs.  An attempt to take the sqrt() of negative x raises an invalid exception and causes an NaN to be returned
     (except that the square root of -0 is valid and equal to -0.)

SEE ALSO
     fenv(3), math(3)

STANDARDS
     The cbrt(), cbrtf(), cbrtl(), sqrt(), sqrtf(), and sqrtl() functions conform to ISO/IEC 9899:1999 (``ISO C99'').

HISTORY
     The cbrt() function appeared in 4.3BSD.  The sqrtl() function appeared in FreeBSD 8.0.  The cbrtl() function appeared in FreeBSD 9.0.

BSD
								   March 5, 2011							       BSD