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1. $\lim_{x \to 0} \frac{\cos 2 x - \cos x}{x^{2}}$

A. $- \frac{3}{2}$
B. $- \frac{3}{2}$
C. $- \frac{3}{2}$
D. $- \frac{3}{2}$

Answer: Option B

Explanation:

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