題組內容
1. Evaluate the following limits
(b)\( \lim_{x \to 0} \frac{\cos(x) - 1}{x^3 + 2x} \) . (5%)
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1. Evaluate the following limits
(b)\( \lim_{x \to 0} \frac{\cos(x) - 1}{x^3 + 2x} \) . (5%)