std::cosh
From cppreference.com
                    
                                        
                    
                    
                                                            
                    |   Defined in header <cmath>
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|   float       cosh( float arg );  | 
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|   double      cosh( double arg );  | 
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|   long double cosh( long double arg );  | 
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|   double      cosh( Integral arg );  | 
(since C++11) | |
Computes hyperbolic cosine of arg
[edit] Parameters
| arg | - | floating point value | 
[edit] Return value
hyperbolic cosine of arg
[edit] See also
|    computes hyperbolic sine (sh(x))  (function)  | |
|   hyperbolic tangent   (function)  | |
|    (C++11)  | 
   hyperbolic arc cosine   (function)  | 
|    computes hyperbolic cosine of a complex number (ch(z))    (function template)  | |
|    applies the function std::cosh to each element of valarray   (function template)  | |