mirror of https://github.com/mkerrisk/man-pages
31 lines
741 B
Groff
31 lines
741 B
Groff
.\" Copyright 2002 Walter Harms (walter.harms@informatik.uni-oldenburg.de)
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.\" Distributed under GPL
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.\"
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.TH CACOS 3 2002-07-28 "" "Linux Programmer's Manual"
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.SH NAME
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cacos, cacosf, cacosl \- complex arc cosine
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.SH SYNOPSIS
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.B #include <complex.h>
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.sp
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.BI "double complex cacos(double complex " z );
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.br
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.BI "float complex cacosf(float complex " z );
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.br
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.BI "long double complex cacosl(long double complex " z );
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.sp
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Link with \fI\-lm\fP.
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.SH DESCRIPTION
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The
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.BR cacos ()
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function calculates the complex acos().
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If y = cacos(z), then z = ccos(y).
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The real part of y is chosen in the interval [0,pi].
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.LP
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One has cacos(z) = \-i clog(z + csqrt(z * z \- 1)).
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.SH "CONFORMING TO"
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C99
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.SH "SEE ALSO"
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.BR ccos (3),
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.BR clog (3),
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.BR complex (7)
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