# 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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## Details

detailSectionParagraph## Permanent Citation

"Two Visual Proofs of a Basic Trigonometric Identity"

http://demonstrations.wolfram.com/TwoVisualProofsOfABasicTrigonometricIdentity/

Wolfram Demonstrations Project

Published: March 7 2011