Two Visual Proofs of a Basic Trigonometric Identity
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This Demonstration shows two visual proofs of the identity .
Contributed by: Izidor Hafner (March 2011)
Open content licensed under CC BY-NC-SA
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"Two Visual Proofs of a Basic Trigonometric Identity"
http://demonstrations.wolfram.com/TwoVisualProofsOfABasicTrigonometricIdentity/
Wolfram Demonstrations Project
Published: March 7 2011