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CHAPTER 4.  TRIGONOMETRY


                              4.2 Definitions and Graphs of Trigonometric
                              Functions


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                                         =                                         =
                                    =
                                                         Figure 58.
                                    =
                                            ó
                              367.  ëáå α  =  =
                                            ê
                              =
                                            ñ
                              368.  Åçë α =   =
                                            ê
                              =
                                            ó
                              369.  í~å α  =  =
                                            ñ
                              =
                                            ñ
                              370.  Åçí α  =  =
                                            ó

                              =





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