# How is this true?

likearollings
Can anybody tell me how this is true.

THE FIRST X DOT IS SUPPOSED TO BE SQUARED!!!!
http://img442.imageshack.us/img442/1264/80680201.jpg [Broken]
THE FIRST X DOT IS SUPPOSED TO BE SQUARED!!!!

(I was given an equation and this is the LHS. I had to differentiate it with respect to x (i think) and this is the result, what is where the ... is?) I had to differentiate an equation and show it equaled another. I have got the RHS right, just cant work out how the LHS goes to 2x double dot

Any help is appreiciated

I suspect the chain rule is involved

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