My Math Forum Chain Rule

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 February 17th, 2010, 02:43 PM #1 Newbie   Joined: Feb 2010 Posts: 10 Thanks: 0 Chain Rule Ok so I have the proof for the chain rule in my notes. Should I tweak that proof to prove this: $(g \circ f)''= g'(f(a))f''(a) + g''(f(a))(f#39;(a))^2$ or should I take another approach?
 February 17th, 2010, 04:09 PM #2 Senior Member   Joined: Feb 2009 From: Adelaide, Australia Posts: 1,519 Thanks: 3 Re: Chain Rule It depends on what you are allowed to use. It is quite easy to derive if you use the chain rule to write down (g(f(a))', then differentiate again using the product and chain rules.

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