simplify the question given in the picture
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( n² + y² - z² )² - ( n² - y² + z² )² = n⁴ + y⁴ + z⁴ + 2n²y² - 2n²z² - 2y²z² - ( n⁴ + y⁴ + z⁴ - 2n²y² + 2n²z² - 2y²z² ) = n⁴ + y⁴ + z⁴ + 2n²y² - 2n²z² - 2y²z² - n⁴ - y⁴ - z⁴ + 2n²y² - 2n²z² + 2y²z² = 4n²y² - 4n²z²
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