Page 47 - sss_Neat
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   = 2   sin(    ) cos(    )
                                   
                                          ′
                                            = 2   sin(    )



                                                    1
                                        = (2   − 1)    
                                        
                                                    4

                                                   1
                                        = (   − 1)    
                                        
                                                   2





                                   = 2   cos(    ) sin(    )
                                   
                                          ′
                                           = 2   cos(    )



                                                   1
                                        = (   − 1)    
                                        
                                                   2

                                                    1
                                       = (2   − 1)    
                                        
                                                    4





                                                                   
                          = √                                    =
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