asinh, asinhf---inverse hyperbolic sine Synopsis
#include <math.h> double asinh(double x); float asinhf(float x);
Description
asinh calculates the inverse hyperbolic sine of x.
asinh is defined as
sgn(x) * log(abs(x) + sqrt(1+x*x))
asinhf is identical, other than taking and returning floats.
Returns
asinh and asinhf return the calculated value.
Portability
Neither asinh nor asinhf are ANSI C.
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