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1. $2, \sqrt{5}$

Answer: Option D

Explanation:

α = \cos^{- 1} (\frac{3^{2} - 2^{2} - {(\sqrt{5})}^{2}}{2 \times 2 \times \sqrt{5}}) = \cos^{- 1} (\frac{9 - 4 - 5}{4 \sqrt{5}}) = \cos^{- 1} (0) = 90 °

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