y^8+y^4+1
добавляем до полного квадрата
y^8+2y^4+1 - y^4=(y^4+1)² - (y²)²=(y^4+1-y²)(y^4+1+y²)
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y^8+y^4+1
добавляем до полного квадрата
y^8+2y^4+1 - y^4=(y^4+1)² - (y²)²=(y^4+1-y²)(y^4+1+y²)