Can somebody explain this to me?

Find:

$\displaystyle \frac{\partial^2g}{\partial t^2}$

where $\displaystyle g(r,s)$ is an arbitrary function and

$\displaystyle r(x,t)=x+ct$ and $\displaystyle s(x,t)=x-ct$

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- Oct 24th 2009, 02:02 PMbillymNot understanding these functions inside of functions...
Can somebody explain this to me?

Find:

$\displaystyle \frac{\partial^2g}{\partial t^2}$

where $\displaystyle g(r,s)$ is an arbitrary function and

$\displaystyle r(x,t)=x+ct$ and $\displaystyle s(x,t)=x-ct$ - Oct 24th 2009, 02:56 PMadkinsjr

Since you indicate that you are having trouble with these kinds of derivatives in general, I think it would be best to just link you to this:

http://tutorial.math.lamar.edu/Class...ChainRule.aspx

Your example is a very basic one, so see if you can find the derivative after reading the tutorial. - Oct 24th 2009, 03:29 PMbillym
thanks! just what I needed.