ELEMENTS OF PLANE TRIGONOMETRY WITH FIVE-PLACE TABLES TEXT-BOOK FOR HIGH SCHOOLS, TECHNICAL SCHOOLS AND COLLEGES BY ROBERT E. MORITZ PBJ. NEBRASKA, PH. N. D. STRASSBURG, PROFESSOR OF MATHEMATICS. UNIVERSITY OF WASHINGTON NEW YORK JOHN WILEY SONS, INC. LONDON-CHAPMAN HALL, LIMITED COPYRIGHT, 1910 BY ROBERT . MORITZ Printed in U. S. A. . H. GILSON COMPANY BOSTON. U. S. A. PREFACE TRIGONOMETRY is college mathematics par excellence. To at least 90 per cent of all liberal arts students college mathematics means trigonometry and nothing else. It is important, therefore, that the science be presented in as simple and attractive a manner as possible and that it be made more than a mere method of solving triangles. The first the author tries to accomplish by making the treatment less technical than is customary, by introducing considerable historical matter, by not presupposing a too ready knowledge of elementary mathematics, and none at all of the topics ordinarily treated in college algebra....