src/pj_msfn.c


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/* determine constant small m */
#ifndef lint
static const char SCCSID[]="@(#)pj_msfn.c	4.3	93/06/12	GIE	REL";
#endif
#include <math.h>
	double
pj_msfn(double sinphi, double cosphi, double es) {
	return (cosphi / sqrt (1. - es * sinphi * sinphi));
}