Cho $(E) : \frac{x^{2}}{a^{2}}+\frac{y^{2}}{y^{2}}=1       I(x_0;y_0)$ 
Chứng minh tiếp tuyến của $(E)$ tại $I$ có dạng
$ \frac{x.x_0}{a^{2}}+\frac{y.y_0}{b^{2}}=1      $ 

bị xóa vì bị trùng bởi Đức Vỹ 27-10-13 10:54 AM

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

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