In Exercises 110, use trigonometric identities and assume
Chapter 8, Problem 8.1.1.261(choose chapter or problem)
In Exercises 1–10, use trigonometric identities and assume \(0 \leq \alpha<\pi / 2\)
Given that \(\cot 2 \alpha=1 / \sqrt{3}\), find \(\cos 2 \alpha\).
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