QPaperGen

\[
f'(x) = 3x^2 - \frac{3}{x^4} = \frac{3x^6 - 3}{x^4}
\]

Set derivative to zero:
\[
f'(x) = 0 \Rightarrow x^6 = 1 \Rightarrow x = \pm 1
\]

Sign of derivative:
\[\] \( f'(x) > 0 \) in \( (-\infty, -1) \cup (1, \infty) \) ⟹ Increasing
\[\] \( f'(x) < 0 \) in \( (-1, 1) \) ⟹ Decreasing