数列\(\left\{ {{a}_{n}} \right\}\)的通项\({{a}_{n}}={{n}^{2}}({{\cos }^{2}}\dfrac{n\pi }{3}-{{\sin }^{2}}\dfrac{n\pi }{3})\),其前\(n\)项和为\({{S}_{n}}\),则\({{S}_{30}}\)为_______.
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