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Math Help - Chain Rule for 2 Variables

  1. #1
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    Chain Rule for 2 Variables

    Let a=x-ct and b=x+ct. Show that fab=ftt-c2fxx. Hint: The chain rule for 2 varibles is daf(x,y)=fxxa+fyya.

    I'm assuming that f(a,b), a(x,t), and b(x,t).

    Thanks in advance.
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  2. #2
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    Re: Chain Rule for 2 Variables

    Hey karebear688.

    Show us what you have tried.
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