(x² + 4y²-9z²)²-16x²y²
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use formula,
a² - b² = (a - b)(a + b)
given,
(x² +4y² -9z² )² - 4x²y²
(x² +4y² -9z²-4x²y²)(x² +4y² -9z²+4x²y²)
{(x+2y)²-9z²}{(x-2z)²-9z²}
(x+2y-3z)(x+2y+3z)(x-2y-3z)(x-2y+3z)
a² - b² = (a - b)(a + b)
given,
(x² +4y² -9z² )² - 4x²y²
(x² +4y² -9z²-4x²y²)(x² +4y² -9z²+4x²y²)
{(x+2y)²-9z²}{(x-2z)²-9z²}
(x+2y-3z)(x+2y+3z)(x-2y-3z)(x-2y+3z)
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