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1. x+y-1-x-y×2yx2-y2-1

  • A. 1
  • B. 1
  • C. 1
  • D. 1

Answer: Option B

Explanation:

x+y-1-x-y-1×2yx2-y2-11x+y-1x-y×2yx2-y2x-y-x-yx+yx-y×2yx2-y2-2yx2-y2×2yx2-y2-4y2x2-y22

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