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plot -4(pi^2 - 3x^2), -48(cos(x) - cos(2x) / 4 + cos(3x) / 9 - cos(4x) / 16) from -pi to pi
plot -4(pi^2 - 3x^2), -48(cos(x) - cos(2x) / 4 + cos(3x) / 9 - cos(4x) / 16) from -pi to pi
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