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$\int e^{- x} \{\frac{1}{x} + \frac{1}{x^{2}}\} d x$ এর যোজিত ফল কত?

\frac{- e^{x}}{x^{2}} + c

\frac{e^{- x}}{x} + c

\frac{e^{- x}}{x^{2}} + c

\frac{- e^{- x}}{x^{2}} + c

- x e^{- x} + c

ANS : 4

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