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Excerpt from Plane Trigonometry This book is designed to meet the needs of beginners who wish to master the fundamental principles of Trigonometry. The author's aim has been to prepare a text-book which shall be clear and practical, yet thoroughly scientific. The proofs of formulas are simple but rigorous. The use of directed lines is consistent; the directions of such lines in the figures are usually indicated by arrowheads, and these lines are always read from origin to end. Both trigonometric ratios and trigonometric lines are employed, but at first the ratios are used exclusively until they have become fixed in mind and familiar. It is proved that the ratios are the measures of the lines, and that, therefore, any relation which holds true for the one holds true for the other also. 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.

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9781440046698

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