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January 30th, 2014, 05:18 PM   #1
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derivative of unit vector

So, a simple question. How derivate an unit vector wrt any variable? I can derivate any unit vector wrt ? or ?, obivious, but how derivate the vector ? wrt to x, for example? What is the rule? What is formula? I already searched and I not found.
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January 31st, 2014, 01:43 PM   #2
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Re: derivative of unit vector

Let u be unit vector. Use chain rule.

du/dx = ?u/??d?/dx + ?u/??d?/dx
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