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Math Help - Not understanding these functions inside of functions...

  1. #1
    Member billym's Avatar
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    Not understanding these functions inside of functions...

    Can somebody explain this to me?

    Find:

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

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

    r(x,t)=x+ct and s(x,t)=x-ct
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  2. #2
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    Quote Originally Posted by billym View Post
    Can somebody explain this to me?

    Find:

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

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

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



    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.
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  3. #3
    Member billym's Avatar
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    thanks! just what I needed.
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