-5.97363X^3+6.520776X^2-4.7437X-0.38832=0
    x^2-6x+23
    -7.81691X^3+8.315228X^2-5.37796X+0.876087=0
    -7.81691X^3+8.315228X^2-5.37796X+6.862577=0
    0=(-1.40557x^3+0.77526x^2+0.1583x-0.06831)*(ln(85860/387.7))^3+(17.93006x^3-9.22091^2-2.37733x+0.86295)*(ln(85860/387.7))^2+(-79.99715x^3+40.5562x^2+9.00157x-2.54543)*(ln(ln(85860/387.7))+122.656069x^3-63.88418x^2-9.58936x+0.213960366
    0=(-1.40557x^3+0.77526x^2+0.1583x-0.06831)*((ln(85860/387.7))^3+(17.93006x^3-9.22091^2-2.37733x+0.86295)*((ln(ln(85860/387.7))^2+(-79.99715x^3+40.5562x^2+9.00157x-2.54543)*((ln(ln(85860/387.7))+(122.656069x^3-63.88418x^2-9.58936x+6.20045)
    arctan0.2x+arctan0.0625x=25
    3t²+40t-400
    X^3+3x-4=0
    （cosx)^3＝16/17
    （cosx)^3＝16/17
    arctanx+arctan0.5x=25
    3x+1/2x-1
    279.5*213.5*0.505-(279.5)*(213.5)*(0.505-x*0.001)=x*0.001
    279.5*213.5*0.505-(279.5-x*0.001)*(213.5-x*0.001)*(0.505-x*0.001)=x*0.001
    100-(20-x)*(10-x)*(0.5-x)=x
    100-(20-x)*(10-x)*(0.5-x)=x
    x^3-x=990
    x^3-1=0
    0.000934477x^2-0.01961376x+0.952365828-1/0.93496=0

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