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f (x) = \frac{1}{e^{- x}}

L i m_{h \to 0} \{\frac{f (x + h) - f (x)}{h}\}

এর মান কোনটি?

e^{- x}

\frac{1}{e^{x}}

e^{x}

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

ANS : 3

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