Chain rule help

1. Aug 12, 2012

Mgarrettny

Can someone help me out with what I believe who.d be a straight chain rule application?

D/dx (dy/dx)^2

I would think, applying the chain rule, you get

2 (dy/dx) d/dx (dy/dx) = 2 (dy/dx) (d2y/dx2)

But, from the papers I checked, the (dy/dx) in the answer goes away, leaving just

2 (d2y/dx2)

What am I missing?

2. Aug 12, 2012

Byron Chen

Can you rewrite your question in LaTex? I don't quite follow what you are saying.

3. Aug 12, 2012

arildno

If you have referred correctly to the paper, the paper is wrong.

4. Aug 12, 2012

Mgarrettny

Sorry everyone, ignore this.

5. Aug 12, 2012

Mgarrettny

Thanks arildo, especially for the light speed reply. The paper was right, it was I who was wrong. I did not realize the paper was differentiating by y not x. Mea culpa.