If $f(x)$ is continuous and $f(9 / 2)=2 / 9$, then $\lim _{x \rightarrow 0} f\left(\frac{1-\cos 3 x}{x^{2}}\right)$ is equal to:
$9 / 2$
0
$2 / 9$
Correct Option: , 3
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