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Given that $-3<x \leq – \dfrac{1}{2}$ and $\dfrac{1}{2} < y \leq 7$, which of the following statements is true? 

  1. $\max (x+y)(x-y)] – \min[(x+y)(x-y)]=57 \dfrac{1}{2}$
  2. $\max[(x+y)^2]=169/4$
  3. $\min[(x-y)^2]=1$
  4. All of the above
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