Description
E.W. Hobson’s A Treatise on Plane Trigonometry is a comprehensive text intended for serious mathematics students. It rigorously covers elementary trigonometry, including the properties of circular functions, logarithms, and triangle solutions.
The treatise then advances to analytical topics like De Moivre’s theorem, infinite series for sine and cosine, and the foundational theory of complex numbers, grounding the subject in modern analysis and setting the stage for further mathematical study.









