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1. $\int \frac{2 x d x}{1 + x^{2}}$

A. $\tan^{- 1} x + c$
B. $\tan^{- 1} x + c$
C. $\tan^{- 1} x + c$
D. $\tan^{- 1} x + c$

Answer: Option B

Explanation:

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