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The algebraic expansion of (x + y - z)2 is
  • x2 + y2 + z2 + 2xy + 2 yz + 2 zx
  • x2 + y1 + z2 + 2xy + 2yz - 2zx
  • x2 + y2 + z2 + 2xy - 2yz - 2zx
  • x2 + y2 + z2 - 2xy - 2yz - 2zx

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