Sines and Cosines, Part 3 (Addition formulas)
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http://www.projectmathematics.com/sincos3.htm  


Project MATHEMATICS!, California Institute of Technology  
A videotapeandworkbook module that explores a basic topic in high school mathematics in ways that cannot be done at the chalkboard or in a textbook. Animation relates the sine and cosine of an angle with chord lengths of a circle, as explained in Ptolemy's Almagest. This leads to elegant derivations of addition formulas, with applications to simple harmonic motion.  


Levels:  High School (912) 
Languages:  English 
Resource Types:  Multimedia, Video, Lesson Plans and Activities, Textbooks 
Math Topics:  Conic Sections and Circles, History and Biography, Trigonometry 
Math Ed Topics:  Audiovisual/Multimedia, Curriculum/Materials Development 
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