## Linux and UNIX Man Pages

Test Your Knowledge in Computers #825
Difficulty: Medium
The term API seems to appear for the first time in the article of Ira W. Cotton, Data structures and techniques for remote computer graphics, published in 1968.
True or False?

# casinh(3) [debian man page]

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
The casinh() function calculates 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. CONFORMING TO
asinh(3), cabs(3), cimag(3), csinh(3), complex(7) COLOPHON
This page is part of release 3.44 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/. 2008-08-11 CASINH(3)

## Check Out this Related Man Page

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
asinh(3), cabs(3), cimag(3), csinh(3), complex(7) COLOPHON

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