cos
From cppreference.com
                    
                                        
                    
                    
                                                            
                    |   Defined in header  
<math.h>
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|   float       cosf( float arg ); 
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(since C99) | |
|   double      cos( double arg ); 
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|   long double cosl( long double arg ); 
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(since C99) | |
Computes cosine of arg
[edit] Parameters
| arg | - | floating point value representing angle in radians | 
[edit] Return value
Cosine of arg in the range [-1.0 ; 1.0]. 
Domain error occurs if arg is infinite. NAN is returned in that case.
[edit] See also
|    computes sine (sin(x))  (function)  | 
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|    computes tangent (tan(x))  (function)  | 
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|   computes arc cosine (arccos(x))   (function)  | 
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