Question

${y2 + x2} \times y2 + x2$

Answer 1

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y² + x² × y² + x²

=> y² ( y² + x² ) + x² ( y² + x² )

=> y⁴ + x²y² + x²y² + x⁴

=> x⁴ + y⁴ + 2x²y²

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