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lim(n->oo)[1/n^2 sec^2(pi/(3n^2))+2/n...

`lim_(n->oo)[1/n^2 sec^2(pi/(3n^2))+2/n^2 sec^2((4pi)/(3n^2))+3/n^2 sec^2((9pi)/(3n^2))+.......+1/n sec^2(pi/3)]`

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