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...semantics to our pythag() from above The Info (e.g. in Linux Emacs C-h i "m libc") about "Libc" contains (in the section "Exponentiation and Logarithms"): ============================= >> - Function: double hypot (double X, double Y) >> - Function: float hypotf (float X, float Y) >> - Function: long double hypotl (long double X, long double Y) >> These functions return `sqrt (X*X + Y*Y)'. This is the length of >> the hypotenuse of a right triangle with sides of length X and Y, >> or the distance of the point (X...