dos_acosh - dalefugier/DOSLib GitHub Wiki
Returns the angle whose hyperbolic cosine is the specified number.
Syntax
(dos_acosh number)
Parameters
number
The number, which should be >= 1.0.
Returns
The inverse hyperbolic cosine of the number, if successful.
nil if not successful or on error.
Example
Command: (dos_acosh 1)
0
Command: (dos_acosh 10)
2.99322