Proof of second order derivative

manish15689
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How to prove that

y''=d2y/dx2

if y=f(x)
 
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?
That's just expressing the equivalence between two different types of notation conventions..
 
i want to know how does the notation d2y/dx2 come into existence...
 
manish15689 said:
i want to know how does the notation d2y/dx2 come into existence...

Leibniz introduced it. Why would that be of any interest??
 

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