Excerpt from A Treatise of Plane and Spherical Trigonometry, in Theory and Practice: Adapted to the Use of Students One main object of the publisher is to furnish a treatise of trigonometry, plane and spherical, of a middle size between the concise elementary tracts containing the definitions and a few theorems barely necessary to the solution of the common cases of triangles, and the larger and more comprehensive works, designed for the use of mathematicians, or of students who have time, ability, and inclination to enter deeply into such curious and difficult speculations. 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.