題目 Problem (10 points) Find the following limits. (a) limx→3x2+x−12x−3\lim_{x \to 3} \dfrac{x^2+x-12}{x-3}limx→3x−3x2+x−12. (b) limx→0x2secx−1\lim_{x \to 0} \dfrac{x^2}{\sec x-1}limx→0secx−1x2. 解答
