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1. $c o s 15^{\circ}$

A. $\frac{\sqrt{3} - 1}{2 \sqrt{2}}$
B. $\frac{\sqrt{3} - 1}{2 \sqrt{2}}$
C. $\frac{\sqrt{3} - 1}{2 \sqrt{2}}$
D. $\frac{\sqrt{3} - 1}{2 \sqrt{2}}$

Answer: Option D

Explanation:

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