$
\int\limits_{e}^{e^2}\frac{dx}{cos^2(1+lnx)}
$ 

bị xóa vì bị trùng bởi Đức Vỹ 24-10-13 05:00 PM

Câu hỏi này có nội dung hoàn toàn trùng với câu hỏi đã có.

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