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1. $\sin (2 \tan^{- 1} \frac{1}{2}) = ?$

A. $\frac{\sqrt{5}}{4}$
B. $\frac{\sqrt{5}}{4}$
C. $\frac{\sqrt{5}}{4}$
D. $\frac{\sqrt{5}}{4}$

Answer: Option C

Explanation:

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