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

12.6 shacpi - Half-Cycle Havercosine hac(πx)

#include <msca.h> 
 
double shacpi (double x); 
float  shacpif(float x);

Given a value x this function computes the half-cycle havercosine of x , hac(πx)  .