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a1eaacb1 1'\" t
fea681da 2.\" Copyright 2002 Walter Harms (walter.harms@informatik.uni-oldenburg.de)
2297bf0e 3.\"
95fb8859 4.\" SPDX-License-Identifier: GPL-1.0-or-later
fea681da 5.\"
4c1c5274 6.TH ccos 3 (date) "Linux man-pages (unreleased)"
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7.SH NAME
8ccos, ccosf, ccosl \- complex cosine function
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9.SH LIBRARY
10Math library
8fc3b2cf 11.RI ( libm ", " \-lm )
fea681da 12.SH SYNOPSIS
c7db92b9 13.nf
fea681da 14.B #include <complex.h>
68e4db0a 15.PP
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16.BI "double complex ccos(double complex " z );
17.BI "float complex ccosf(float complex " z );
18.BI "long double complex ccosl(long double complex " z );
c7db92b9 19.fi
fea681da 20.SH DESCRIPTION
f0a0305b 21These functions calculate the complex cosine of
a6899b95 22.IR z .
847e0d88 23.PP
51065a83 24The complex cosine function is defined as:
207050fa 25.PP
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26.in +4n
27.EX
28ccos(z) = (exp(i * z) + exp(\-i * z)) / 2
29.EE
30.in
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31.SH ATTRIBUTES
32For an explanation of the terms used in this section, see
33.BR attributes (7).
34.TS
35allbox;
c466875e 36lbx lb lb
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37l l l.
38Interface Attribute Value
39T{
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40.na
41.nh
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42.BR ccos (),
43.BR ccosf (),
44.BR ccosl ()
45T} Thread safety MT-Safe
46.TE
847e0d88 47.sp 1
3113c7f3 48.SH STANDARDS
4131356c
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49C11, POSIX.1-2008.
50.SH HISTORY
51glibc 2.1.
52C99, POSIX.1-2001.
47297adb 53.SH SEE ALSO
fea681da 54.BR cabs (3),
f54fb0fa 55.BR cacos (3),
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56.BR csin (3),
57.BR ctan (3),
a8bda636 58.BR complex (7)