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CHAPTER 4.  TRIGONOMETRY


                              376.  `çí~åÖÉåí=cìåÅíáçå==
                                    ó = Åçí  ñ I= ≠ â I== ∞ Åçí ñ  ≤  ∞ K=
                                                   π
                                                           ≤
                                                       −
                                              ñ
                                    =























                                                                                          =
                                    =
                                                         Figure 62.
                                    =
                              377.  pÉÅ~åí=cìåÅíáçå=
                                    ó = ëÉÅ ñ I= ñ ≠ (  N ) â O +  π K=
                                                         O
                                    ==






















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