Publisher's Synopsis
Excerpt from Plane Trigonometry, Vol. 1: With the Use of Logarithms
But the word is now used in a much more extended sense, so as to include all manner of algebraical reason ing about lines and angles, whether parts of a triangle or not, and, particularly, when that reasoning is carried on by means of certain quantities, which are called the trigonometrical Ratios or Functions of an angle.
Of these Ratios we shall speak presently, so far as the subject of plane trigonometry is concerned. But we must first make some remarks upon the mode in which lines and angles are represented for the purposes of algebraical reasoning.
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