1CASIN(3)                   Linux Programmer's Manual                  CASIN(3)
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NAME

6       casin, casinf, casinl - complex arc sine
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SYNOPSIS

9       #include <complex.h>
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11       double complex casin(double complex z);
12       float complex casinf(float complex z);
13       long double complex casinl(long double complex z);
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15       Link with -lm.
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DESCRIPTION

18       These  functions calculate the complex arc sine of z.  If y = casin(z),
19       then z = csin(y).  The real  part  of  y  is  chosen  in  the  interval
20       [-pi/2,pi/2].
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22       One has:
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24           casin(z) = -i clog(iz + csqrt(1 - z * z))
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VERSIONS

27       These functions first appeared in glibc in version 2.1.
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ATTRIBUTES

30       For  an  explanation  of  the  terms  used  in  this  section,  see at‐
31       tributes(7).
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33       ┌────────────────────────────────────────────┬───────────────┬─────────┐
34       │Interface                                   │ Attribute     │ Value   │
35       ├────────────────────────────────────────────┼───────────────┼─────────┤
36       │casin(), casinf(), casinl()                 │ Thread safety │ MT-Safe │
37       └────────────────────────────────────────────┴───────────────┴─────────┘
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CONFORMING TO

40       C99, POSIX.1-2001, POSIX.1-2008.
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SEE ALSO

43       clog(3), csin(3), complex(7)
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COLOPHON

46       This page is part of release 5.13 of the Linux  man-pages  project.   A
47       description  of  the project, information about reporting bugs, and the
48       latest    version    of    this    page,    can     be     found     at
49       https://www.kernel.org/doc/man-pages/.
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53                                  2021-03-22                          CASIN(3)
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