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Delving Deeper
Delving Deeper: Chordic vs. CORDIC: How Calculators and Students Compute Sines and Cosines

Bryan C. Dorner Edited by Maurice Burke, J. Kevin Colligan, Maria Fung, and Jeffrey J. Wanko 

February 2013, Volume 106, Issue 6, Page 472

This article compares two algorithms that compute values of the sine and cosine functions using analytic geometry and the unit circle definition of sine and cosine. One algorithm uses chords on the circle and the other uses tangents.

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Additional history about the chordic and CORDIC algorithms (PDF)

Grades 9-12