Excerpt from The Elements of Plane Trigonometry
In preparing this book the author had two ends in view:
First, to give the student an elementary knowledge of the science of Trigonometry, together with an introduction to the theory of functions as illustrated by the trigonometric ratios.
Second, to give him practice in the art of computation. Especial stress has been laid on this side of the subject for the reason that many students have no other experience with the calculation of approximate numbers. The value of preliminary estimates of results and the necessity of frequent checking are constantly insisted on. This feature is believed to be novel.
The chapter on the Right Triangle is an informal introduction to the subject. The use of natural functions is advised here that the student may become familiar with them. In the remainder of the book logarithms are used in all computations. In order to meet what seems to be the demand at the present time, the author has worked the illustrative problems with five-place logarithms.
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