a⁴ + a² + 1 = a⁴ + 2a² + 1 - a² = (a² + 1)² - a² = (a² + 1 - a)*(a² + 1 + a)
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a⁴ + a² + 1 = a⁴ + 2a² + 1 - a² = (a² + 1)² - a² = (a² + 1 - a)*(a² + 1 + a)