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Essentials of Trigonometry is written by Karl J. Smith and published by Thomson Brooks/Cole. It's available with International Standard Book Number or ISBN identification 0534348068 (ISBN 10) and 9780534348069 (ISBN 13).
Following the same presentation of and features for Trigonometry for College Students, Seventh Edition, this text was built by beginning with the right angle definition and applications involving the solution of right triangles.