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Evaluate

\frac{d y}{d x},

y = \tan^{- 1} \frac{a + b x}{b - a x}

\frac{a b}{1 + x^{2}}

\frac{1}{a b + x^{2}}

\frac{1}{1 + x^{2}}

\frac{1}{a b x^{2} + 1}

ANS : 3

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