Trygonometric Delights, and introduction of trygonometry free books

in this post I provide a simple review of the two free books that I found after browsing about trigonometry, there is no end to the discussion of the triangle, we can explore a part of this mathematics ranging from history, until a new theory about the true triangle, two books that can be download for free following a discussion about two different things but actually interrelated, the first book can be downloaded at the following link

Trigonometric Delights

This Book Begins by examining the "proto-trigonometry" of the Egyptian pyramid builders. It shows how Greek astronomers developed the first true trigonometry. It traces the Slow Emergence of modern, analytical trigonometry, recounting its Origins in Renaissance Europe's quest for more accurate Artillery, more precise clocks, and more pleasing musical instruments.
The following book reveals history from time to time regarding the development of a triangle formula as well as its application in building the history of human civilization, for example about, Recreational Mathematics in Ancient Egypt, Epicycloids and Hypocycloids, more information, please read and downloaded directly on the link provided.
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An introduction to TRIGONOMETRY
The next is a book that should be compulsory reading for lovers or for beginners to learn trygonometry, why because this book presents the complete formula, an explanation of the basics trygonometry very important to understand.for exampleTrigonometric circle and AnglesTrigonometric numbers of a real number tBasic formulasRelated valuesTrigonometric functionsInverse trigonometric FunctionsSum formulasTrigonometric equationsfor more details please read and learn more at the link below
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