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1. $\sin^{- 1} \frac{2}{3}$

A. $\cot \frac{\sqrt{5}}{2}$
B. $\cot \frac{\sqrt{5}}{2}$
C. $\cot \frac{\sqrt{5}}{2}$
D. $\cot \frac{\sqrt{5}}{2}$

Answer: Option B

Explanation:

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