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(A² *A²) +(A² *-A) +(A² *-1) +(A*A²) +(A*-A) +(1* -A) +(1*A²) +(1*-A) +(1*-1)
=A⁴ - A³ - A² + A³ - A² - A + A² - A -1
=A⁴ - A² - 2A - 1
Saludos....