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Homework Help: Eliminate paramter

  1. Apr 17, 2012 #1
    1. The problem statement, all variables and given/known data

    Eliminate the parameter and express in x and y

    x= 2-3cos2t y= 5+7sin2t

    2. Relevant equations

    3. The attempt at a solution

    I tried changing them in terms of cos^2t and sin^2t. I change the first equation into ((x-5)/6) = cos^2t. But I can't figure out how to change the second one in terms of sin^2t.
  2. jcsd
  3. Apr 17, 2012 #2


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    Science Advisor
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    Gold Member

    Use ##\cos^2(2t)+\sin^2(2t)=1##.
  4. Apr 17, 2012 #3
    Ahh thanks didn't know you could do that
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