(x^2 + x^2 + x^2 + x^2). x^-2 = 4x^2 . x^-2 = 4^0 = 1
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(x^2 + x^2 + x^2 + x^2). x^-2 = 4x^2 . x^-2 = 4^0 = 1
saludos