casin(3) - f39

1casin(3)                   Library Functions Manual                   casin(3)
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NAME

6       casin, casinf, casinl - complex arc sine
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LIBRARY

9       Math library (libm, -lm)
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SYNOPSIS

12       #include <complex.h>
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14       double complex casin(double complex z);
15       float complex casinf(float complex z);
16       long double complex casinl(long double complex z);
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DESCRIPTION

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

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

38       C11, POSIX.1-2008.
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HISTORY

41       glibc 2.1.  C99, POSIX.1-2001.
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