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CACOS(3) Library Functions Manual CACOS(3)

NAME

cacos, cacosf, cacoslcomplex circular 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);

DESCRIPTION

The cacos(), cacosf() and cacosl() functions compute the complex circular arc cosine of z.
For all complex floating-point numbers z,
cacos(z) = Pi/2 - casin(z).

RETURN VALUES

The cacos(), cacosf() and cacosl() functions return the complex circular arc cosine of z with unbounded imaginary part, and real part in the interval [0, Pi].

SEE ALSO

casin(3), catan(3)

STANDARDS

The cacos(), cacosf() and cacosl() functions conform to ISO/IEC 9899:1999 (“ISO C99”).
June 5, 2013 OpenBSD-current