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y = \tan^{- 1} (\frac{a + x}{1 - a x}), \frac{d y}{d x} = ?

1 / (a^{2} - x^{2})

1 / (1 - a x)^{2}

1 / (1 + x^{2})

- 1 / (1 + x^{2})

1 / (a^{2} + x^{2})

ANS : 3

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