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Consider a linear time-invariant system whose input $r(t)$ and output $y(t)$ are related by the following differential equation:

  $$\frac{d^{2}y(t)}{dt^{2}}+4y(t)=6r(t)$$

  The poles of this system are at

  1. $+2j, -2j$
  2. $+2,-2$
  3. $+4,-4$
  4. $+4j,-4j$
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