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-'\" t
-.\" Copyright 2002 Walter Harms (walter.harms@informatik.uni-oldenburg.de)
-.\"
-.\" SPDX-License-Identifier: GPL-1.0-or-later
-.\"
-.TH casin 3 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-casin, casinf, casinl \- complex arc sine
-.SH LIBRARY
-Math library
-.RI ( libm ", " \-lm )
-.SH SYNOPSIS
-.nf
-.B #include <complex.h>
-.P
-.BI "double complex casin(double complex " z );
-.BI "float complex casinf(float complex " z );
-.BI "long double complex casinl(long double complex " z );
-.fi
-.SH DESCRIPTION
-These functions calculate the complex arc sine of
-.IR z .
-If \fIy\ =\ casin(z)\fP, then \fIz\ =\ csin(y)\fP.
-The real part of
-.I y
-is chosen in the interval [\-pi/2,pi/2].
-.P
-One has:
-.P
-.nf
-    casin(z) = \-i clog(iz + csqrt(1 \- z * z))
-.fi
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface	Attribute	Value
-T{
-.na
-.nh
-.BR casin (),
-.BR casinf (),
-.BR casinl ()
-T}	Thread safety	MT-Safe
-.TE
-.SH STANDARDS
-C11, POSIX.1-2008.
-.SH HISTORY
-glibc 2.1.
-C99, POSIX.1-2001.
-.SH SEE ALSO
-.BR clog (3),
-.BR csin (3),
-.BR complex (7)