My Math Forum derivative of unit vector

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 January 30th, 2014, 04:18 PM #1 Senior Member   Joined: Nov 2013 Posts: 137 Thanks: 1 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.
 January 31st, 2014, 12:43 PM #2 Global Moderator   Joined: May 2007 Posts: 6,511 Thanks: 585 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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### d/dx of unit bector

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