std::cosh(std::complex)
From cppreference.com
                    
                                        
                    
                    
                                                            
                    |   Defined in header <complex>
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|   template< class T >  complex<T> cosh( const complex<T>& z );  | 
(since C++11) | |
Computes complex hyperbolic cosine of a complex value z. 
[edit] Parameters
| z | - | complex value | 
[edit] Return value
Complex hyperbolic cosine of z
[edit] See also
|    computes cosine of a complex number (cos(z))   (function template)  | |
|    (C++11)  | 
   computes arc cosine of a complex number (arccos(z))   (function template)  |