NAME

cacos, cacosf, cacosl — complex circular arc cosine

SYNOPSIS

Math Library (libm, -lm)
#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”).