Plane and Spherical Trigonometry
by Elmer A. Lyman, Edwin C. Goddard
Publisher: Allyn and Bacon 1900
Number of pages: 157
A trigonometry textbook that treats the solution of triangles quite fully and elaborates analytical trigonometry. It covers angles, trigonometric functions, inverse functions, trigonometric equations and identities, triangles, spherical trigonometry.
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by I. Todhunter - Macmillan and co
The present work contains all the propositions usually included under the head of Spherical Trigonometry, together with a large collection of examples for exercise. The examples have been selected from the University and College Examination Papers.
Book 1 is pre-calculus trigonometry. We assume the student is relatively new to algebra and do algebra step by step. Many of the pages have closely related free/YouTube videos at the Khan Academy. Many students find the video presentation helpful.
by Marcel B. Finan - Arkansas Tech University
The text represents a serious effort to produce exposition that is accessible to a student at the freshmen or high school levels. The chapters of this book are well suited for a one semester course in College Trigonometry.
by W. E. Paterson - Clarendon Press
In this book the trigonometrical ratios are introduced as functions of the angle. The trigonometrical properties of the single angle are treated fully in the early chapters, and the examples apply Trigonometry wherever it may be useful.