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Homework Help: Find the orthogonal trajectories

  1. Feb 22, 2013 #1
    Hi all

  2. jcsd
  3. Feb 22, 2013 #2


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    Science Advisor

    Start all over again! Each "[itex]\lambda[/itex]" gives a different member of the family of curves. To have an equation that describes the family and not an individual member, you have to elimininate [itex]\lambda[/itex]. That's the whole point of differentiating.
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