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For the function $e^{-x}$, the linear approximation around $x=2$ is

  1. $(3-x) e^{-2}$
  2. $1-x$
  3. $[3+2 \sqrt{2}-\left(1+\sqrt{2}\right) x] e^{-2}$
  4. $e^{-2}$
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