tanx = 0.62
    tanx = 0.66
    x/2-(5x+8)/6＝1+(2x-4)/3
    x/2-(5+8)/6＝1+(2x-4)/3
    x/2-(5+8)/6＝1+(2-4)/3
    x^2+x-240=0
    3-(2x-1)/3=(4-3x)/5-x
    X^3-2X^2+1=0
    -1.066=(1/x)*ln(1-x)
    1839688.38--9448-314019.6-(165137.61-14795.53-x/1.03*0.03-37213.09)*1.12=x
    1839688.38--448-314019.6-(165137.61-14795.53-x/1.03*0.03-37213.09)*1.12=x
    -1.059=(1/x)*ln(1-x)
    0.187=0.137*x^-3+0.119*x^-2+0.269*x^-1
    1839688.38-(165137.61-14795.53-x/1.03*0.03)*1.12=x
    -1.046=(1/x)*ln(1-x)
    0.4534=0.137*x^-3+0.119*x^-2+0.269*x^-1
    y^4-4y^3+4y^2+y-1=0
    y^4-4y^3+4y^2+y-1=0
    y^4-4y^3+4y^2+y-1=0
    y^4-y^3+y^2+y-1=0

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