Mathematics

Problem

f(x)

is continuous and

f\left(\frac{9}{2}\right)=\frac{2}{9}

, then

\lim_{x\to 0} f\left(\frac{1-\cos 3x}{x^2}\right)

is equal to: (1)

\frac{9}{2}

(2) 0 (3)

\frac{2}{9}

(4)

\frac{8}{9}