題目 Problem (1) (10 pts) Evaluate the followings. (a) limx→01cosx\lim_{x \to 0} \dfrac{1}{\cos x}limx→0cosx1. (b) limx→01−cosxex−1−x\lim_{x \to 0} \dfrac{1-\cos x}{e^x-1-x}limx→0ex−1−x1−cosx. 解答
