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Manual Section... (3) - page: cacosh
NAME
cacosh, cacoshf, cacoshl - complex arc hyperbolic cosineSYNOPSIS
#include <complex.h>
double complex cacosh(double complex z);
float complex cacoshf(float complex z);
long double complex cacoshl(long double complex z);
DESCRIPTION
The cacosh() function calculates the complex arc hyperpolic cosine 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 nonnegative.One has:
cacosh(z) = (0.5) * clog((1 + z) / (1 - z))
VERSIONS
These functions first appeared in glibc in version 2.1.CONFORMING TO
C99.SEE ALSO
acosh(3), cabs(3), cimag(3), complex(7)COLOPHON
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Time: 15:26:50 GMT, June 11, 2010