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\frac{d}{d x} (x \tan^{- 1} x)

এর মান হলো-

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

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

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

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

ANS : 2

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