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Trig Identity - Never Seen This Before

  1. Sep 7, 2009 #1
    1. The problem statement, all variables and given/known data
    http://carlodm.com/images/m.png [Broken]

    2. Relevant equations

    sin2 et + cos2 et = 1

    The identity above is foreign to me. Can anyone explain/have external links that explains this identity? I haven't seen anything like it and Google isn't showing anything useful.

    Last edited by a moderator: May 4, 2017
  2. jcsd
  3. Sep 7, 2009 #2
    Nevermind. I realized it's just sin^2 (x) + cos^2 (x) = 1.

    It looked weird. Same angles threw me off
  4. Sep 7, 2009 #3
    That happens to all of us.

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