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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 Wed Jul 23 05:24:21 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 CACOS 3 2002-07-28 "" "complex math routines"
.SH ̾
cacos, cacosf, cacosl \- ʣǿε; (arc cosine)
.SH
.B #include <complex.h>
.sp
.BI "double complex cacos(double complex " z );
.br
.BI "float complex cacosf(float complex " z );
.br
.BI "long double complex cacosl(long double complex " z );
.sp
\-lm ǥ롣
.SH
cacos() ؿʣǿ acos() 롣
y = cacos(z) ʤС z = ccos(y) Ω롣
y μͤ϶ [0,pi] 롣
.LP
δطΩ: cacos(z) = -i clog(z+csqrt(z*z-1))
.SH
C99
.SH Ϣ
.BR ccos (3),
.BR clog (3),
.BR complex (5)
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