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Homework Help: Trig Equations

  1. Nov 18, 2007 #1
    1. The problem statement, all variables and given/known data
    Solve for x.
    tan(2x) = 8cos(x)^2 - cot(x) where x is between 0 to 90 degrees.

    2. Relevant equations
    tan(2x) = 2tan(x)/1-tan(x)^2
    cot(x) = 1/tan(x)

    3. The attempt at a solution

    tan(2x) = 8cos(x)^2 - cot(x)
    2tan(x)/1-tan(x)^2 + 1/tan(x) = 8cos(x)^2
    (2tan(x)^2 + (1-tan(x)^2))/(tan(x)-tan(x)^3) = 8cos(x)^2

    I am stuck at this point. Any help would be great since this is due tomorrow. Thanks.
  2. jcsd
  3. Nov 18, 2007 #2

    correct? just making sure, i'm not really sure about your 2nd term.
  4. Nov 18, 2007 #3
    Yes, you are correct.
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