Show that `f(x)=x^(1//3)` is not differentiable at `x=0` .

Explanation

To show that the function \( f(x) = x^{1/3} \) is not differentiable at \( x = 0 \), we need to evaluate the left-hand derivative and the right-hand derivative at that point and show that they are not equal.

### Step 1: Define the function and the point of interest
We have the function:
\[ f(x) = x^{1/3} \]
We want to check the differentiability at \( x = 0 \).
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