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(2x+3y)⁴
⇔ 1 (2x)⁴ (3y)⁰ + 4 (2x)³ (3y)¹ + 6 (2x)² (3y)² + 4 (2x)¹ (3y)³ + 1 (2x)⁰ (3y)⁴
⇔ 1 (16x⁴) + 4 (8x³)(3y) + 6 (4x²)(9y²) + 4 (2x)(27y³) + 1 (81y⁴)
⇔ 16x⁴ + 96x³y + 216x²y² + 216xy³ + 81y⁴