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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 2002-07-28 "" "complex math routines"
.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
\-lm ǥ롣
.SH
catan() ؿʣǿ atan() 롣
y = catan(z) ʤС z = ctan(y) Ω롣
y μͤ϶ [-pi/2,pi/2] 롣
.LP
δطΩ: catan(z) = 1/2i clog((1+iz)/(1-iz))
.SH
C99
.SH Ϣ
.BR ccos (3),
.BR clog (3),
.BR complex (5)
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