sqrt man page on 4.4BSD

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

     cbrt, sqrt — cube root and square root functions

     #include <math.h>

     cbrt(double x);

     sqrt(double x);

     The cbrt() function computes the cube root of x.

     The sqrt() computes the non-negative square root of x.

     The cbrt() function returns the requested cube root.  The sqrt() function
     returns the requested square root unless an error occurs.	On the VAX or
     Tahoe processor an attempt to take the sqrt() of negative x causes an
     error; in this event, the global variable errno is set to EDOM and a
     reserved operand fault is generated.

ERROR (due to Roundoff etc.)
     The cbrt() function is accurate to within 0.7 ulps.

     The sqrt() function on a VAX is accurate to within 0.501 ulps.  Sqrt on a
     machine that conforms to IEEE 754 is correctly rounded in accordance with
     the rounding mode in force; the error is less than half an ulp in the
     default mode (round-to-nearest).  An ulp is one Unit in the Last Place

     math(3), infnan(3)

     The sqrt function conforms to ANSI X3.159-1989 (“ANSI C89”).

     The cbrt function appeared in 4.3BSD.

BSD				 June 4, 1993				   BSD

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