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## Main Question or Discussion Point

So I am trying to find the nth derivative of the curvature function:

[itex]\kappa(x)[/itex] = [itex]\frac{f''(x)}{[1 + (f'(x))^2]^\frac{3}{2}}[/itex]

Now, I could go about using Faa Di Bruno's formula but when I did I realized that I also have to use the Leibniz formula as a substitution for a term in the Faa Di Bruno formula. Once I did that low and behold I had to use Faa Di Bruno's formula again for a term in Leibniz formula... so on and so forth about two times again. Is there any easier route to go about finding the nth derivative?

[itex]\kappa(x)[/itex] = [itex]\frac{f''(x)}{[1 + (f'(x))^2]^\frac{3}{2}}[/itex]

Now, I could go about using Faa Di Bruno's formula but when I did I realized that I also have to use the Leibniz formula as a substitution for a term in the Faa Di Bruno formula. Once I did that low and behold I had to use Faa Di Bruno's formula again for a term in Leibniz formula... so on and so forth about two times again. Is there any easier route to go about finding the nth derivative?