Excerpt from A Treatise on Plane and Spherical Trigonometry IN this edition, besides a number of minor changes, and the correction of some typographical errors, a very important modification has been made in the solution of the equation tan a: p tan y by series (p. Which was given in former editions in the usual form as stated by all writers on trigonometry. This form was dis covered to lack generality, and consequently to fail in certain applications, in con sequence of the omission of the arbitrary term mr now introduced. Several subse quent investigations, depending on this, have in like manner been rectified. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.