What does 2nd ord pde tell you? like fxx(x,y)

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brandy
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pure and mixed, what do they tell you about a function?
 
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? Exactly what they say- they tell you about how the function, and its first and second derivatives, are related. If not that I don't know what you are looking for.
 
is there a graphical representation of what it looks like?
 

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