題組內容
7. Evaluate the following limits
(a)\[ \lim_{x \to 0} \lim_{y \to 0} \frac{x^2 - 4y^2}{x^2 + 4y^2} \] (5%)
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7. Evaluate the following limits
(a)\[ \lim_{x \to 0} \lim_{y \to 0} \frac{x^2 - 4y^2}{x^2 + 4y^2} \] (5%)