We have
$$ L = \lim_{x \to 0^+} 9x^2 \cot(x) = \lim_{x \to 0^+} 9x^2 \frac{\cos(x)}{\sin(x)} $$
As $x \to 0^+$, $9x^2 \to 0$, $\cos(x) \to 1$, and $\sin(x) \to 0^+$.
Therefore, we have an indeterminate form of type $0 \cdot \frac{1}{0^+}$, which is equivalent to
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