asinh, asinhf—inverse hyperbolic sine #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.