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1. $\frac{d}{d x} (\tan^{- 1} \frac{4 x}{1 - 4 x^{2}})$

A. $\frac{4}{1 + 4 x^{2}}$
B. $\frac{4}{1 + 4 x^{2}}$
C. $\frac{4}{1 + 4 x^{2}}$
D. $\frac{4}{1 + 4 x^{2}}$

Answer: Option A

Explanation:

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