Giúp mình g) x^2(1 - x^2) - 4 - 4x^2; h) (1 + 2x)(1 - 2x) - x(x + 2)(x - 2)

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g) x^2(1 - x^2) - 4 - 4x^2;
h) (1 + 2x)(1 - 2x) - x(x + 2)(x - 2)