你的校园怎么样？你的校园里都有什么？你喜欢你的校园吗？请你以“我的校园”为题，给大家介绍一下你的校园吧，注意按一定的顺序哦！

若{a_n}为等差数列，S_n是其前n项的和，且$S_{11}=\frac{22}{3}\mathrm{\pi }$，则$\tan a_6=$（ ）

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