sqrt - square root function
#include <math.h>
double sqrt(double x);
The sqrt() function returns the non-negative square root of x. It
fails and sets errno to EDOM, if x is negative.
EDOM x is negative.
SVID 3, POSIX, BSD 4.3, ISO 9899
hypot(3)
1993-06-21 SQRT(3)
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