How to Differentiate Cross Product?

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nabi1995
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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)?


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Thank you,

mathwonk said:
just like any other product. leibniz rule.

I solved the equation. Thank you!