11. Which of the following functions are not differentiable at \( x = \frac{2}{3} \) ?
I. \( f(x) = \sqrt[3]{x-2} \)
II. \( g(x) = |3x - 2| \)
III. \( h(x) = |9x^2 - 4| \)
Answer is: option4
Solution:
.
