((((a-b)²+2ab)²-2a²b²)²-2a⁴b⁴)²-a¹⁶-b¹⁶
=(((a²-2ab+b²+2ab)²-2a²b²)²-2a⁴b⁴)²-a¹⁶-b¹⁶= (((a²+b²)²-2a²b²)²-2a⁴b⁴)²-a¹⁶-b¹⁶= ((a⁴+2a²b²+b⁴-2a²b²)²-2a⁴b⁴)²-a¹⁶-b¹⁶= ((a⁴+b⁴)²-2a⁴b⁴)²-a¹⁶-b¹⁶ = (a⁸+2a⁴b⁴+b⁸-2a⁴b⁴)²-a¹⁶-b¹⁶=(a⁸+b⁸)²-a¹⁶-b¹⁶ = (a¹⁶+2a⁸b⁸+b¹⁶-a¹⁶-b¹⁶=2a⁸b⁸