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1. $\cos A = \frac{13}{14}$

A. $\frac{3 \sqrt{3}}{14}$
B. $\frac{3 \sqrt{3}}{14}$
C. $\frac{3 \sqrt{3}}{14}$
D. $\frac{3 \sqrt{3}}{14}$

Answer: Option D

Explanation:

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