man3/ccos.3

   1 .\" Copyright 2002 Walter Harms (walter.harms@informatik.uni-oldenburg.de)
   2 .\"
   3 .\" SPDX-License-Identifier: GPL-1.0-or-later
   4 .\"
   5 .TH CCOS 3 2021-03-22 "" "Linux Programmer's Manual"
   6 .SH NAME
   7 ccos, ccosf, ccosl \- complex cosine function
   8 .SH LIBRARY
   9 Math library
  10 .RI ( libm ", " \-lm )
  11 .SH SYNOPSIS
  12 .nf
  13 .B #include <complex.h>
  14 .PP
  15 .BI "double complex ccos(double complex " z ");"
  16 .BI "float complex ccosf(float complex " z ");"
  17 .BI "long double complex ccosl(long double complex " z ");"
  18 .fi
  19 .SH DESCRIPTION
  20 These functions calculate the complex cosine of
  21 .IR z .
  22 .PP
  23 The complex cosine function is defined as:
  24 .PP
  25 .nf
  26     ccos(z) = (exp(i * z) + exp(\-i * z)) / 2
  27 .fi
  28 .SH VERSIONS
  29 These functions first appeared in glibc in version 2.1.
  30 .SH ATTRIBUTES
  31 For an explanation of the terms used in this section, see
  32 .BR attributes (7).
  33 .ad l
  34 .nh
  35 .TS
  36 allbox;
  37 lbx lb lb
  38 l l l.
  39 Interface       Attribute       Value
  40 T{
  41 .BR ccos (),
  42 .BR ccosf (),
  43 .BR ccosl ()
  44 T}      Thread safety   MT-Safe
  45 .TE
  46 .hy
  47 .ad
  48 .sp 1
  49 .SH CONFORMING TO
  50 C99, POSIX.1-2001, POSIX.1-2008.
  51 .SH SEE ALSO
  52 .BR cabs (3),
  53 .BR cacos (3),
  54 .BR csin (3),
  55 .BR ctan (3),
  56 .BR complex (7)