Let $A = \{ (x, y) : y = e^x, x \in R \} $ and $B = \{ (x, y) : y = e^{-x}, x \in R \} $. Then

  • A
    $A \cap B = \phi $
  • B
    $A \cap B \neq \phi $
  • C
    $A \cup B = R^2$
  • D
    None of these

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