Pythagorean trigonometric identity

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What Wikipedia says

The Pythagorean trigonometric identity, also called simply the Pythagorean identity, is an identity expressing the Pythagorean theorem in terms of trigonometric functions. Along with the sum-of-angles formulae, it is one of the basic relations between the sine and cosine functions.

Excerpt from the Wikipedia article “Pythagorean trigonometric identity”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

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