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.\" Copyright 2002 Walter Harms (walter.harms@informatik.uni-oldenburg.de)
.\" Distributed under GPL
.\"
.\" Japanese Version Copyright (c) 2003 Akihiro MOTOKI
.\" all rights reserved.
.\" Translated Thu Jul 24 00:22:25 JST 2003
.\" by Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>
.\"
.\"WORD: arc sine
.\"WORD: arc cosine ;
.\"WORD: arc tangent
.\"WORD: real part
.\"WORD: imaginary part
.\"
.TH CATAN 3 2008-08-06 "" "Linux Programmer's Manual"
.SH ̾
catan, catanf, catanl \- ʣǿε (arc tangent)
.SH
.B #include <complex.h>
.sp
.BI "double complex catan(double complex " z );
.br
.BI "float complex catanf(float complex " z );
.br
.BI "long double complex catanl(long double complex " z );
.sp
\fI\-lm\fP ǥ롣
.SH
.BR catan ()
ؿʣǿ
.I z
ε (arc tangent) 롣
\fIy = catan(z)\fP ʤС \fIz = ctan(y)\fP Ω롣
.I y
μͤ϶ [\-pi/2,pi/2] 롣
.LP
δطΩ:
.nf
catan(z) = 1 / 2i clog((1 + iz) / (1 \- iz))
.fi
.SH С
δؿ glibc С 2.1 ǽо줷
.SH
C99.
.SH Ϣ
.BR ccos (3),
.BR clog (3),
.BR complex (7)
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