Some linear relations between values of trigonometric functions at kπ/n
Volume 81 / 1997
                    
                    
                        Acta Arithmetica 81 (1997), 387-398                    
                                        
                        DOI: 10.4064/aa-81-4-387-398                    
                                    
                                                                
                             
             
                                                             
                                                             
                                                             
                                                             
                                                             
                                                             
                                                         
                                                            