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  Calculate position vector and derivative unit vector

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What is the difference between calculating the unit vector + derivative separate like positionVector/normPosVector and derivativeVector/normDerVect example position and velocity and calculating the derivative norm vector as d(positionVector/ normPosVector) when we use one or the other method? Thanks a lot! John

Closed as per community consensus as the post is not graduate-level
asked May 11, 2018 in Closed Questions by Fred [ no revision ]
recategorized May 11, 2018 by Dilaton

This is a graduate+ level site. Please ask elementary questions on other online platforms. 

This question is not graduate+ level Users with 500+ reputation may vote here to close.

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