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How to Differentiate Cross Product?

  1. Jul 16, 2007 #1
    Hi all,

    I have a qustion.

    dB/ds= -TN, dU/ds= KN (1)
    N= U x B (2)

    dN/ds=TB-KU (3)

    How Eq.(3) can be obtained from Eq.(1),(2)?

    Have a nice day!
  2. jcsd
  3. Jul 16, 2007 #2


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    product rule
  4. Jul 17, 2007 #3


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    just like any other product. leibniz rule.
  5. Jul 17, 2007 #4
    Thank you,

    I solved the equation. Thank you!
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