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Homework Help: Plug cos^2(30) into my scientific calculator

  1. Dec 4, 2006 #1
    How would I plug cos^2(30) into my scientific calculator to get the right answer? Thanks.
     
  2. jcsd
  3. Dec 4, 2006 #2

    arildno

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    What does cos^2(30) mean? :smile:
     
  4. Dec 4, 2006 #3
    I don't remember, its been years since I've done that kind of math.
     
  5. Dec 4, 2006 #4

    arildno

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    Well, then, look it up in a math book.

    Hint: What does ^2 mean in the expression?
     
    Last edited: Dec 4, 2006
  6. Dec 4, 2006 #5
    There is a distinct difference between cos T^2 and cos^2 T. (Pretend that T=the angle.) Your problem asks for cos^2 T, or (cos T)^2 (calculator form). This means (cos T)(cos T), rather than cos (T*T).
     
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