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cos((pi*x)/2) = 0
24*x^3-26*x^2+9*x-1;12*x^2-7*x+1
1*x^2-(3*x)+0*x^3-4 = 0
(2-(6*x))*(3*x+9) >= x^2-9
1*x^2-(3*x)+0*x^3-4 = 0
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