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The Sum of the Sines of a Sum and Difference of Two Angles

This Demonstration provides a visual proof of the formula .
The area of the large rectangle is . The area of colored quadrilateral is . It equals the sum of the pink triangle with area and the brown triangle with area .

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 Izidor Hafner
"The Sum of the Sines of a Sum and Difference of Two Angles"
 http://demonstrations.wolfram.com/TheSumOfTheSinesOfASumAndDifferenceOfTwoAngles/
 Wolfram Demonstrations Project
 Published: January 16, 2012
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