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1. $\tan^{- 1} \frac{1}{2} + \tan^{- 1} \frac{1}{3} = ?$

A. $\frac{π}{4}$
B. $\frac{π}{4}$
C. $\frac{π}{4}$
D. $\frac{π}{4}$

Answer: Option A

Explanation:

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