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Man Page :: Unix Man Pages - cacosl

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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 );

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))

CONFORMING TO

C99