Pythagorean trigonometric identity

noun

The equality sin (x)²+ cos (x)²=1, holding for all real and complex x, equivalent to the application of the Pythagorean theorem to the unit circle.

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Meanings

nounPythagorean trigonometric identity (plural Pythagorean trigonometric identities)

plural Pythagorean trigonometric identities

  1. mathematicsThe equality sin (x)²+ cos (x)²=1, holding for all real and complex x, equivalent to the application of the Pythagorean theorem to the unit circle.

Translations

Finnish trigonometrinen identiteetti
  • trigonometrinen identiteettistatement that sum of squares of sine and cosine equals one
Polish jedynka trygonometryczna
  • jedynka trygonometrycznastatement that sum of squares of sine and cosine equals one
Cite this entry
APA

Pythagorean trigonometric identity. (n.d.). In WatkinsX Dictionary. Retrieved November 5, 2026, from https://dictionary.watkinsx.com/word/Pythagorean%20trigonometric%20identity

MLA

“Pythagorean trigonometric identity.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/Pythagorean%20trigonometric%20identity. Accessed November 5, 2026.

Chicago

WatkinsX Dictionary, s.v. “Pythagorean trigonometric identity,” accessed November 5, 2026, https://dictionary.watkinsx.com/word/Pythagorean%20trigonometric%20identity.

Source: Pythagorean trigonometric identity on Wiktionary, CC BY-SA 4.0.