(x + 1)²-(y-1)²
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Answer:
x²-y²+2(x+y)
Step-by-step explanation:
(x+1)²-(y-1)²
=(x²+2x+1)-(y²-2y+1)
=x²+2x+1-y²+2y-1
=x²-y²+2(x+y)
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