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`acosh', `acoshf'--inverse hyperbolic cosine
double acosh(double X);
float acoshf(float X);
`acosh' calculates the inverse hyperbolic cosine of X. `acosh' is
log(X + sqrt(X*X-1))
X must be a number greater than or equal to 1.
`acoshf' is identical, other than taking and returning floats.
`acosh' and `acoshf' return the calculated value. If X less than 1,
the return value is NaN and `errno' is set to `EDOM'.
You can change the error-handling behavior with the non-ANSI
Neither `acosh' nor `acoshf' are ANSI C. They are not recommended for
Created Mon Nov 8 17:42:56 2004 on tillpc with info_to_html version 0.9.6.