Trigonometry by Don Crossfield, Charlyn Shepherd, Robert Stein, Grace Williams

Book Contents :-
1. The Beginnings of Trigonometry 2. Shadow Reckoning 3. Development of Ptolemy's Table 4. The Laws of Sines and Cosines, Brahmagupta's and Heron's Theorems. 5. Charting the Heavens 6. Triangle Applications 7. Trigonometric Identities 8. Spherical Trigonometry 9. Biographies

About this book :-
"Trigonometry" by Don Crossfield, Charlyn Shepherd, Robert Stein, and Grace Williams is a comprehensive "trigonometry textbook" designed for high school and early college students. The book focuses on "trigonometric functions", identities, and equations, making it an ideal resource for students building a strong foundation in mathematics. With clear explanations and practical examples, it bridges the gap between "geometry" and "precalculus", helping learners understand both the theory and real-world applications of trigonometry. The textbook emphasizes "problem-solving skills", guiding students through exercises that develop logical thinking and analytical abilities. Core concepts such as angles, sine, cosine, tangent, and their applications in triangles and circles are thoroughly covered. By combining conceptual clarity with step-by-step solutions, the authors ensure that learners not only memorize formulas but also understand how to apply them in various contexts, from simple calculations to more advanced mathematical problems. This book is particularly useful for students, educators, and anyone preparing for higher-level mathematics courses. Its structured approach and engaging examples make learning "trigonometry" accessible and effective. Whether used as a classroom text or self-study guide, it provides a solid foundation for success in mathematics. The key topics — "trigonometric functions, identities, equations, geometry, pre-calculus" — are highlighted throughout, making it a reliable reference for mastering the subject.

Book Detail :-
Title: Trigonometry by Don Crossfield, Charlyn Shepherd, Robert Stein, Grace Williams
Publisher: Historical Modules Project
Year: 2002
Pages: 192
Type: PDF
Language: English
ISBN-10 #: 1477497781
ISBN-13 #: 978-1477497784
License: External Educational Resource
Amazon: Amazon

About Author :-
The author Don Crossfield, Charlyn Shepherd, Robert Stein, and Grace Williams are "mathematics educators" who collaborated to create an accessible and student-focused textbook on "trigonometry". Their work reflects a strong commitment to clear instruction, emphasizing conceptual understanding over rote memorization. The authors designed the material to support learners transitioning from "algebra and geometry" into more advanced mathematical thinking. Through their collaborative approach, the authors focus on "mathematics education", practical examples, and structured problem-solving. Their textbook is widely used as a learning resource for high-school and early college students, helping build confidence in "trigonometric functions" and foundational "pre-calculus" concepts in a clear and approachable way.

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