13. x2y (x3 – x + 1) – xy (x4 – 2x2 + 2x) – y (x3 – x2 - 1)
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Answer:
X45y
Step-by-step explanation:
X3-x+1=y(x2)
X+x=2x
Y+y=2y
So, answer is X45y
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