Wolfram Demonstrations Project
7899

Cosine and Sine of the Sum of Two Angles

The formulas for and are derived using purely geometric reasoning, avoiding the usual cumbersome algebraic manipulations. Proceed through steps 1–5 to follow the derivation.

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 Tomas Garza
"Cosine and Sine of the Sum of Two Angles"
 http://demonstrations.wolfram.com/CosineAndSineOfTheSumOfTwoAngles/
 Wolfram Demonstrations Project
 Published: July 1, 2011




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