php man page for casinh

CASINH(3)						     Linux Programmer's Manual							 CASINH(3)

NAME
       casinh, casinhf, casinhl - complex arc sine hyperbolic

SYNOPSIS
       #include <complex.h>

       double complex casinh(double complex z);
       float complex casinhf(float complex z);
       long double complex casinhl(long double complex z);

       Link with -lm.

DESCRIPTION
       These functions calculate the complex arc hyperbolic sine of z.	If y = casinh(z), then z = csinh(y).  The imaginary part of y is chosen in
       the interval [-pi/2,pi/2].

       One has:

	   casinh(z) = clog(z + csqrt(z * z + 1))

VERSIONS
       These functions first appeared in glibc in version 2.1.

ATTRIBUTES
       For an explanation of the terms used in this section, see attributes(7).

       +-------------------------------+---------------+---------+
       |Interface		       | Attribute     | Value	 |
       +-------------------------------+---------------+---------+
       |casinh(), casinhf(), casinhl() | Thread safety | MT-Safe |
       +-------------------------------+---------------+---------+
CONFORMING TO
       C99, POSIX.1-2001, POSIX.1-2008.

SEE ALSO
       asinh(3), cabs(3), cimag(3), csinh(3), complex(7)

COLOPHON
       This page is part of release 4.15 of the Linux man-pages project.  A description of the project, information about reporting bugs, and  the
       latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.

								    2015-04-19								 CASINH(3)