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GATE ECE 2006 | Question-29

As $x$ is increased from $-\infty$ to $\infty$, the function $$ f(x)=\frac{e^x}{1+e^x} $$

  1. monotonically increases
  2. monotonically decreases
  3. increases to a maximum value and then decreases
  4. decreases to a minimum value and then increases
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