cacos, cacosf, cacosl — complex arc cosine
#include <complex.h>
double complex
cacos( |
double complex z); |
float complex
cacosf( |
float complex z); |
long double complex
cacosl( |
long double complex z); |
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The cacos() function
calculates the complex arc cosine of z. If y = cacos(z), then z = ccos(y). The real part of
y is chosen in the interval
[0,pi].
One has:
cacos(z) = −i * clog(z + i * csqrt(1 − z * z))
/* Link with "−lm" */
#include <complex.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
int
main(int argc, char *argv[])
{
double complex z, c, f;
double complex i = I;
if (argc != 3) {
fprintf(stderr, "Usage: %s <real> <imag>\n", argv[0]);
exit(EXIT_FAILURE);
}
z = atof(argv[1]) + atof(argv[2]) * I;
c = cacos(z);
printf("cacos() = %6.3f %6.3f*i\n", creal(c), cimag(c));
f = −i * clog(z + i * csqrt(1 − z * z));
printf("formula = %6.3f %6.3f*i\n", creal(f), cimag(f));
exit(EXIT_SUCCESS);
}
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Copyright 2002 Walter Harms (walter.harmsinformatik.uni-oldenburg.de) and Copyright (C) 2011 Michael Kerrisk <mtk.manpagesgamil.com> %%%LICENSE_START(GPL_NOVERSION_ONELINE) Distributed under GPL %%%LICENSE_END |