Plane and Spherical Trigonometry in three parts
by Henry Bedingfield Goodwin
Publisher: Longmans, Green, and Co. 1907
Number of pages: 296
This treatise in the first instance 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 covers the theoretical portion of Plane Trigonometry, Spherical Trigonometry, and the examples in the use of logarithms and in the solution of plane and spherical triangles.
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by Michael Corral - mecmath.net
A text on elementary trigonometry. Though designed for college students, it could also be used in high schools. The traditional topics are covered, but a more geometrical approach is taken than usual. Also, some numerical methods are discussed.
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.
by Florentin Smarandache - viXra.org
This book includes 255 problems of 2D and 3D Euclidean geometry plus trigonometry. The degree of difficulties of the problems is from easy and medium to hard. The solutions are at the end of each chapter. The book is especially a didactic material...
by David E. Joyce - Clark University
This website is a short introduction to Trigonometry by a professor at Clark University. It is very easy to follow, is full of animations and study problems for the reader to work through. You should already be familiar with algebra and geometry.