Plane Trigonometry

Description

Introductory articles have been added to several chapters, giving the background for the ensuing discussion and telling the purpose of the chapter. The illustrative examples have been revised to make them more typical and easier to understand. Many new illustrative examples have been added. In several instances, definitions have been simplified and abbreviated, thus decreasing the amount of memory work necessary. In the chapters dealing with the logarithmic solution of right and oblique triangles, the angles in the problems and in the answers are expressed in terms of degrees, minutes, and tenths of a minute, instead of in degrees, minutes, and seconds. In a further attempt to make the book more teachable, we have postponed the introduction of simple identities to Chapter III, and have devoted Chapter II to the discussion of the non-logarithmic solution of right triangles. We have postponed, also, the introduction of vectors to Chapter IX. Finally, we have placed the chapter on trigonometric equations just before that on inverse functions.