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CHAPTER 4.  TRIGONOMETRY




























                                                                                            =
                                    =
                                                         Figure 63.
                                    =
                              378.  `çëÉÅ~åí=cìåÅíáçå==
                                    ó = Åçë ÉÅ  ñ I= ≠ â K=
                                                      π
                                                 ñ






















                                                                                              =

                                                         Figure 64.




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