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Almost all UNIX operating systems have voluminous documentation known as manual pages. Every page is a document. If one wants to read a page then the command man at a shell prompt will show the manual, for example, "man ftp". Pages are referred by using the notation "name(manual-section)", for example time(1).


Man Page :: Unix Man Pages - cacosh
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NAME

cacosh, cacoshf, cacoshl - complex arc hyperbolic cosine

SYNOPSIS

#include <complex.h>

double complex cacosh(double complex z ); float complex cacoshf(float complex z ); long double complex cacoshl(long double complex z );

Link with -lm.

DESCRIPTION

The cacosh () function calculates the complex arc hyperpolic cosinze of z . If y = cacosh(z), then z = ccosh(y). The imaginary part of y is chosen in the interval [-pi,pi]. The real part of y is chosen non-negative.

One has:



    cacosh(z) = (0.5) * clog((1 + z) / (1 - z))

CONFORMING TO

C99

SEE ALSO

acosh (3) cabs (3) cimag (3) complex (7)



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