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Math Help - Curvature

  1. #1
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    Curvature

    I have to find the curvature of the curve with the equation (4sint)i+(4sint)j+(4cost)k. I use the magnitude of r'xr'' over the magnitude of r'^3. Nothing cancels out for me. Can anybody help??
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  2. #2
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    Quote Originally Posted by Mathwizz View Post
    I have to find the curvature of the curve with the equation (4sint)i+(4sint)j+(4cost)k. I use the magnitude of r'xr'' over the magnitude of r'^3. Nothing cancels out for me. Can anybody help??
    If "Nothing cancels out", then how can anyone help?

    What did you get for r'\times r''~?

    I get <-16,16,0>.
    Last edited by Plato; March 23rd 2011 at 01:17 PM.
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