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plot -241t^7+1062t^6-1871t^5+1647t^4-737t^3+144t^2-2.43t, 0.7<t<0.85
plot -241t^7+1062t^6-1871t^5+1647t^4-737t^3+144t^2-2.43t, 0.7<t<0.85
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