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Sci Advisor
HW Helper
P: 9,398

## Can I use L'Hospitals rule here? (seem like i use it too often...)

Where did the power of 1/3 vanish to? (Note I don't have a simple solution in mind. But it is easy to show that x^4 is differentiable, as is x^3, and hence x^1/3 by the inverse function theorem, hence x^{4/3} is diffible, and it all follows some what simply from these big sounding theorems).