Find for which values of ' \( x \) ', the function: \[ y=x^{4}-\frac{4 x^{3}}{3} \] is increasin...

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Find for which values of ' \( x \) ', the function:
\[
y=x^{4}-\frac{4 x^{3}}{3}
\]
is increasing and for which values, it is decreasing.
\( \mathrm{W} \)
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