acosh
From cppreference.com
                    
                                        
                    
                    
                                                            
                    |   Defined in header  
<math.h>
  | 
||
|   float       acoshf( float arg ); 
 | 
(since C99) | |
|   double      acosh( double arg ); 
 | 
(since C99) | |
|   long double acoshl( long double arg ); 
 | 
(since C99) | |
Computes hyperbolic area cosine of arg
Contents | 
[edit] Parameters
| arg | - | floating point value | 
[edit] Return value
Inverse hyperbolic cosine of arg
[edit] See also
|    (C99) 
 | 
  area hyperbolic sine   (function)  | 
|    (C99) 
 | 
  area hyperbolic tangent   (function)  | 
|   computes hyperbolic cosine (ch(x))  (function)  | 
|
|   
C++ documentation for acosh
 
 | 
|
[edit] External links
Weisstein, Eric W. "Inverse Hyperbolic Cosine." From MathWorld--A Wolfram Web Resource.