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(a - b)³ = a³ - 3a²b + 3ab² - b³
3) (7p⁴ - 6q⁴)³ = (7p⁴)³ - 3(7p⁴)²(6q⁴) + 3(7p⁴)(6q⁴)² - (6q⁴)³
343p¹² -18q⁴ (49p⁸) + 21p⁴ (36q⁸) - 216q¹²
343p¹² - 882p⁸q⁴ + 756q⁸p⁴ - 216q¹²
4) (6m³ - 8n⁵)³ = (6m³)³ - 3(6m³)²(8n⁵) + 3(6m⁵)(8n⁵)² - (8n⁵)³
216m⁹ - 24n⁵(36m⁶) + 18m⁵(64n¹⁰) - 512n¹⁵
216⁹ - 864m⁶n⁵ + 1152n¹⁰m⁵ - 512n¹⁵