cacos(3) — Linux manual pages

Linux manual pages	Section 3

Name

cacos, cacosf, cacosl — complex arc cosine

Synopsis

#include <complex.h>

double complex cacos( double complex z);

float complex cacosf( float complex z);

long double complex cacosl( long double complex z);

	Note
	Link with `−lm`.

DESCRIPTION

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 + csqrt(z * z − 1))

VERSIONS

These functions first appeared in glibc in version 2.1.

CONFORMING TO

C99.

COLOPHON

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