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Homework Help: What is the value of θ, if x = 2(θ − sen θ)

  1. May 12, 2012 #1
    1. The problem statement, all variables and given/known data

    How may I convert this from parametric to cartesian equation?

    2. Relevant equations

    x = 2(θ − sen θ)
    y = 2(1 − cos θ)

    3. The attempt at a solution

    I have a problem finding θ from x = 2(θ − sen θ), I don't know how to do it..
  2. jcsd
  3. May 12, 2012 #2


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    Gold Member

    sen θ?

    Express the trigonometric part in terms of the variables. Then use trigonometric identity.
  4. May 12, 2012 #3

    I like Serena

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    Homework Helper

    What is sen θ?
    Do you mean sin(θ)?
  5. May 12, 2012 #4
    Seno = sine in Spanish, as well as Italian and Piedmontese according to Wikipedia.
  6. May 13, 2012 #5


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    Gold Member

    Solve for θ in terms of y, then plug that into the equation for x. It's still not pretty.
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