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I don't understand one transformation that is made on page 25 of this paper:

http://www.atm.ox.ac.uk/user/read/mechanics/LA-notes.pdf

It is the second equation from the top, ont the one marked as '2', but just the second one.

dx/dt*(\delta x*dx/dt)=1/2\delta(dx/dt)^2

Why is that?

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# Problem with one transformation

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