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Trigonometry -- Problems, exercises, etc.

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S.O.S. Mathematics

With a development team that includes several well-regarded mathematicians and other such folk, the S.O.S. Mathematics website is a high-quality resource for persons who might find themselves in need of a bit of refresher on topics ranging from algebra to differential equations. Started in 1995, the site currently includes more than 2500 web pages that contain concise explanations of topics that...

http://www.sosmath.com
Triangles in the Sky: Trigonometry and Early Theories of Planetary Motion

Humans have long been interested in looking up into the sky and trying to figure out the nature of the planets, the sun, and the moon. Many ancient civilizations were able to systematically observe the sky and eventually they worked out mathematical schemes to describe what they found there. In this compelling article by Sandra M. Caravella, she takes a close look into how they were able to make...

https://www.maa.org/press/periodicals/convergence/triangles-...