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Es el cuadrado de un binomio:
(a+b)² = a²+2ab+b² ; aplicando:
[3x^(4a-5)]² + 2[3x^(4a-5)][2y^(2a+1)]+[2y^(2a+1)]²
9x^2(4a-5)+ 12x^(4a-5)y^(2a+1)+4y^2(2a+1)
9x^(8a-10)+ 12x^(4a-5)y^(2a+1)+4y^(4a+2)