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Prove , if x is a rational number , x ≠ 0 then , tan(x) is not rational

  1. Jan 5, 2013 #1
    prove , if x is a rational number , x ≠ 0 then , tan(x) is not rational

    this theorem was proved by a mathematician called Lambert ,
    I search for the proof , any one knows it ?!
     
  2. jcsd
  3. Jan 5, 2013 #2

    pwsnafu

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  4. Jun 12, 2013 #3
    Last edited: Jun 12, 2013
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