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1. $y = \tan^{- 1} (\frac{2 x}{1 - x^{2}})$

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

Answer: Option B

Explanation:

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