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#include <math.h> double asinh(double x);
This function returns the inverse hyperbolic sine of the argument x.
The inverse hyperbolic sine of x. If the argument x is a
NaN
, the return value is NaN
and errno
is set to
EDOM
. If x is a positive or negative Inf
, the
return value is equal to the value of x, and errno
is left
unchanged.
not ANSI, not POSIX
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