Let a=x-ct and b=x+ct. Show that f_{ab}=f_{tt}-c^{2}f_{xx}. Hint: The chain rule for 2 varibles is d_{a}f(x,y)=f_{x}x_{a}+f_{y}y_{a.} I'm assuming that f(a,b), a(x,t), and b(x,t). Thanks in advance.
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Hey karebear688. Show us what you have tried.
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