Trigonometric Identities

Posted on November 30, 2006 by Andrew Ferguson

Wikipedia has a list of trig identities.

I’m not quite sure what’s worse, the fact that Wikipedia has them or the fact that I need to use them.

Calc III exam at 7:30 6:30.

Here are the three I’ve been using a lot:

  • Sin2[x] = (1-Cos[2x])/2
  • Cos2[x] = (1+Cos[2x])/2
  • Sin2[x] + Cos2[x] = 1

Bah.

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2 Responses to Trigonometric Identities

  1. Sumocat says:
    November 30, 2006 at 7:55 pm

    On the plus side, the third is just the Pythagorean Theorem, which you should have thoroughly memorized, and either of the other two rolls into the other. Fun stuff. And thanks for the list.

    Reply
  2. dabeisyin says:
    December 1, 2006 at 2:21 pm

    what? i suddenly feel very stupid.

    Reply

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