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 DelightsThis 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...

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