A Special Case of the Sum of Two Cosines
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This Demonstration illustrates the formula .
Contributed by: Izidor Hafner (March 2011)
Open content licensed under CC BY-NC-SA
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"A Special Case of the Sum of Two Cosines"
http://demonstrations.wolfram.com/ASpecialCaseOfTheSumOfTwoCosines/
Wolfram Demonstrations Project
Published: March 7 2011