show that f(x)= x^(1/3) is not differentiable at zero.(adsbygoogle = window.adsbygoogle || []).push({});

I know there is a vertical tangent at the origin and therefor not differentiable, but I'm not sure how to say it in analysis.

I have tried using caratheodry but it doesn't seem to get me anywhere

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# Homework Help: Finding the derivative using the definition

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