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= (4m - 5n)² (4m - 5n)
= (16m² - 40mn + 25n²)(4m - 5n)
= 64m³ - 80m²n - 160m²n + 200mn² + 100mn² - 125n³
= 64m³ - 240m²n + 300mn² - 125n³