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a- A = (4x+2y)² = 16x²+16xy+4y²
b- A = (5x+3y)² = 25x²+30xy+9y²
c- A = (x³+2y)² = x⁶+4x³y+4y²
d- A = (x³+y³)² = x⁶+2x³y³+y⁶