From the PREFACE. While the importance of the function concept for elementary mathematics has become recognized by many writers of college algebra texts and of "unified freshman mathematics" books, it has received little recognition from writers on elementary trigonometry. To emphasize this importance has been the leading motive in writing the present book. A somewhat detailed study of the graphs of the trigonometric functions (Chapter V) and of the inverse functions (Chapter VIII) has been introduced for this purpose. ...

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