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January 30th, 2014, 05:18 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, 01:43 PM  #2 
Global Moderator Joined: May 2007 Posts: 6,377 Thanks: 541  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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