The product is a rare math book titled "Plane Trigonometry: A New Approach" by C. L. Johnston. Published in 1978 by Prentice Hall PTR, this textbook is focused on the subject area of mathematics, particularly in the field of trigonometry. With a unique approach to the subject, this hardcover book is 127 pages long and written in English. It is a valuable resource for students and professionals in the field of mathematics and theater, offering a fresh perspective on plane trigonometry.