plot (x^2 - 4) / (x^2 + 4) + cos(pi / 4 * x), 4x / (x^2 + 4) - sin(pi / 4 * x)plot (x^2 - 4) / (x^2 + 4) + cos(pi / 4 * x), 4x / (x^2 + 4) - sin(pi / 4 * x)

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