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2*x^3+24*x-(4*cos(3.14/2)*x) = 0
2*x^3+24*x-4*cos(3.14/2)*x = 0
2*x^3+(24-4*cos(1.57))*x = 0
x*(2*x^2-4*cos(1.57)+24) = 0
2*x^2 = -(24-4*cos(1.57)) // : 2
x^2 = (-(24-4*cos(1.57)))/2
x = 0
x = 0
x = 0
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