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I am new here and I am very happy to find a webpage like this.

It has been 6 years sice I graduated from Physics and I havent dealt with derivatives of vectors for a long time. Recently I have been accepted for the master degree and trying to built my memory again.

My homework quetion is that prove the product rule for two dependent vectors is

d/dt ( r X u ) = r X du/dt + dr/dt X u

I desperatly need help , I just cant remember. thanks

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# Homework Help: How can I prove derivative of cross vectors

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