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 Hugh Blackburn - Macmillan and co
Trigonometry is the science of the numerical relations between the sides and angles of triangles. This treatise is intended to demonstrate how from given values of some of the sides and angles of a triangle to calculate all the others.
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 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.
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.