This is the book that I learned Trig from. Begins with an introduction to the Unit Circle and radian measure, continues with the usual content on Right Triangles, Graphs and the addition formulas and finishes up with Complex Numbers, De Moivre's Theorem and Series. The only thing missing is spherical trig and the answers to even numbered problems. Written in 1955 it is further proof that the best introductory math books (whether Trig, Geometry, Algebra or Calculus) are all from the 1950's and 1960s.

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5/29/24