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Homework Help: Trig. :s

  1. Mar 16, 2009 #1
    1. The problem statement, all variables and given/known data
    Find the values of (theta),in the interval 0degree[tex]\leq(theta)[/tex][tex]\leq180[/tex],for which cos2theta=1/4.Give your answers correct to the nearest integers.

    2. Relevant equations

    3. The attempt at a solution
    do i just tap them in the calculator or how?
  2. jcsd
  3. Mar 16, 2009 #2


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    Science Advisor
    Homework Helper

    I would start by sketching a graph of the function first. You should be able to see that there are two possible values of theta. Then sure, use your calculator to find them.
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