find factorisation
x⁴ + 4y⁴
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☛ x⁴ + 4y⁴
☛ (x²)² + (2y²)²
☛ (x²)² + (2y²)² + 4x²y² - 4x²y²
☛ (x² + 2y²)² - 4x²y²
☛ (x² + 2y²)² - (2xy)²
☛ (x² + 2y² - 2xy) ( x² + 2y² + 2xy)
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i think the answer is this
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