.SH SYNOPSIS
.nf
.B #include <math.h>
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.BI "double asinh(double " x );
.BI "float asinhf(float " x );
.BI "long double asinhl(long double " x );
.fi
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+.P
.RS -4
Feature Test Macro Requirements for glibc (see
.BR feature_test_macros (7)):
.RE
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+.P
.BR asinh ():
.nf
_ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
|| /* Since glibc 2.19: */ _DEFAULT_SOURCE
|| /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
.fi
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+.P
.BR asinhf (),
.BR asinhl ():
.nf
.SH RETURN VALUE
On success, these functions return the inverse hyperbolic sine of
.IR x .
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If
.I x
is a NaN, a NaN is returned.
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If
.I x
is +0 (\-0), +0 (\-0) is returned.
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If
.I x
is positive infinity (negative infinity),
C11, POSIX.1-2008.
.SH HISTORY
C99, POSIX.1-2001.
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The variant returning
.I double
also conforms to