Can you please tell me the answer
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Answer:
(-1 + y^4) by (-1 + y)
= (y^2 + 1) (y + 1)
By factorising (y^4 - 1)
= (y^2 + 1)(y+1)(y-1) by (-1 + y)
= (y^2+1)(y+1)
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