Math Scalar Library
Programming Reference Manual C/C++
Version 1.1 DD-00003-011

12.13 sahavpi - Half-Cycle Archaversine hav-1(x)/π

#include <msca.h> 
 
double sahavpi (double x); 
float  sahavpif(float x);

Given a value x this function computes the half-cycle archaversine of x , hav-1(x)/π .