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যদি

y = e^{\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 : 3

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