(m² - n²m)² + 2m³n²
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= (m² - n²m)² + 2m³n²
= (m⁴ + n⁴m² - 2m³n²) + 2m³n² { ∵ (a + b)² = a² + b² - 2ab }
= m⁴ + n⁴m²
= m² (m² + n⁴)
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