mirror of https://github.com/mkerrisk/man-pages
44 lines
983 B
Groff
44 lines
983 B
Groff
.\" Copyright 2002 Walter Harms (walter.harms@informatik.uni-oldenburg.de)
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.\" %%%LICENSE_START(GPL_NOVERSION_ONELINE)
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.\" Distributed under GPL
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.\" %%%LICENSE_END
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.\"
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.TH CASINH 3 2008-08-11 "" "Linux Programmer's Manual"
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.SH NAME
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casinh, casinhf, casinhl \- complex arc sine hyperbolic
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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 casinh(double complex " z );
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.br
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.BI "float complex casinhf(float complex " z );
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.br
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.BI "long double complex casinhl(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 casinh ()
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function calculates the complex arc hyperbolic sine of
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.IR z .
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If \fIy\ =\ casinh(z)\fP, then \fIz\ =\ csinh(y)\fP.
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The imaginary part of
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.I y
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is chosen in the interval [\-pi/2,pi/2].
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.LP
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One has:
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.nf
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casinh(z) = clog(z + csqrt(z * z + 1))
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.fi
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.SH VERSIONS
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These functions first appeared in glibc in version 2.1.
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.SH CONFORMING TO
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C99.
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.SH SEE ALSO
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.BR asinh (3),
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.BR cabs (3),
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.BR cimag (3),
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.BR csinh (3),
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.BR complex (7)
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