London: C. J. CLAY AND SONS, CAMBRIDGE UNIVERSITY PRESS WAREHOUSE, AVE MARIA LANE. Cambridge: DEIGHTON, BELL AND CO. New York: MACMILLAN AND CO. Pitt Press Mathematical Series. AN ELEMENTARY TREATISE ON PLANE TRIGONOMETRY BY E. W. HOBSON, Sc.D., FELLOW AND ASSISTANT TUTOR OF CHRIST'S COLLEGE, CAMBRIDGE, AND C. M. JESSOP, M.A., FELLOW OF CLARE COLLEGE, CAMBRIDGE, CAMBRIDGE: AT THE UNIVERSITY PRESS. 1892 [All Rights reserved.] IN PREFACE. N the present work, those parts of the subject of Trigonometry are treated, which are usually taught in schools. Although the main object of elementary Trigonometry is to provide methods for the solution of triangles, many developments are given which are not absolutely necessary for this purpose; students who wish to push on as rapidly as possible to the solutions of triangles may omit a good deal of the first part of the book. Those Articles and Chapters which are marked with an asterisk may with advantage be omitted by all students, on a first reading. A very large number of examples is given, but it is not by any means desirable that the student should work them all as he goes along, he should rather, on the first and second readings, try only the earlier portions of each set of examples. The Miscellaneous Examples at the end of the work will be found to be of considerably greater difficulty than those in the text. The authors desire to acknowledge their indebtedness to the Cambridge University Local Examination papers of recent years; the questions in the examination papers at the end of the book are mainly drawn from this source. |