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যদি

y = \tan^{- 1} x

\frac{d y}{d x}

কত?

e^{\tan^{- 1}} x

e^{\tan^{- 1} x} (1 + x^{2})

\frac{e \tan^{- 1} x}{1 + x^{2}}

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

ANS : 4

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