Essentials of Trigonometry with Applications
by D.R. Curtiss, E.J. Moulton
Publisher: D. C. Heath And Company 1942
Number of pages: 190
The distinguishing features of this book are (1) a concise presentation of the fundamental part of plane trigonometry up to the solution of triangles; (2) the use of five-place logarithms in the solution of triangles arid in other applications, with due allowance for the accuracy of data; (3) a chapter on spherical trigonometry; (4) a chapter on applications, which has been written to give essential preparation to those who may enter upon military or naval, service.
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by Henry Bedingfield Goodwin - Longmans, Green, and Co.
This book was intended to serve as an introduction to the study of Navigation and Nautical Astronomy for the junior officers under training in H.M. Fleet. The text plane trigonometry, spherical trigonometry, and the examples in the use of logarithms.
by Elmer A. Lyman, Edwin C. Goddard - Allyn and Bacon
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.
by Steven Sy - Michigan State University
From the table of contents: Review of Functions; Rational Functions; Elementary Trigonometry; Graphing Trigonometric Functions; Trigonometric Identities; Advanced Trigonometric Concepts; Triangle Trigonometry; Selected Answers to the Exercises.
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.