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plot 0.746 * x - 5.501 * x^3 + 13.987 * x^5 and 0.0675 * ArcTan(88 * x)
plot 0.746 * x - 5.501 * x^3 + 13.987 * x^5 and 0.0675 * ArcTan(88 * x)
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