# A Sine/Cosine Identity

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This Demonstration looks at the trigonometric identity . We plot the functions (red curves), (orange curves), and compare the plots of the functions (black, on the left) and (black, on the right); when , they are the same.

Contributed by: Jon Perry (March 2011)

Open content licensed under CC BY-NC-SA

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detailSectionParagraph## Permanent Citation

"A Sine/Cosine Identity"

http://demonstrations.wolfram.com/ASineCosineIdentity/

Wolfram Demonstrations Project

Published: March 7 2011