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Homework Help: Sin^2 x + cos^2 x = 1

  1. Aug 24, 2006 #1
    What is the English word for this rule? It doesn't sound right if I do a direct translation and google didn't turn up much.

    Thank you :smile:
  2. jcsd
  3. Aug 24, 2006 #2
    (One of) The most famous trigonometric identity? ;) You'll generally find it in a list titled that way.
  4. Aug 24, 2006 #3

    Doc Al

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    Staff: Mentor

    I think it's called the Pythagorean identity.
  5. Aug 24, 2006 #4
  6. Aug 24, 2006 #5
    Thanks a lot, both of you. The name for it in my native language has been highly influenced by the number "1" :/
  7. Aug 24, 2006 #6
    What would it be called in your native language? In Danish it is readily called "Idiotformelen" -- the idiot formula...
  8. Aug 24, 2006 #7
    That was funny. It would be "trigonometriska ettan" or "(the) trigonometry 1"
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