Trying to compute the limit of a sequence i get no answer.

is a problem of my notation,problem of LyX or Maxima?

in other problems when changing the notation Maxima computed successfully the limit.

Any help...?

the limit is:

\lim_{n\rightarrow\infty}\left(\frac{\sin\left(\frac{n\cdot\pi}{3}\right)}{n^{2}}\right)