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                      Example 1.10


                                                                                


                                                                      R        h  f



                                                                               φ                             Prof. Ramesh Singh, Notes by Dr.   Singh/ Dr. Colton

                                                   R                             

                                          )                            −1

                                            f
                                          h                               tan


                                          −                                      f

                                          (h                          R        h



                                                                          2

                                               =                          =
                                               φ                          H
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