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    0.9943=(1-1/(1+x)^39)/(1-1/(1+x)^40)
    20lgx=10.4
    arctan0.1w+arctan0.2w+90=133
    arctan0.1w+arctan0.2w+90=130
    6+5x=97
    arctan0.1w+arctan0.2w+90=70
    arctanw+arctan0.5w+ 90=128
    x*x(1+x*x)(1+0.04x*x)=100
    arctanw+arctan0.5w +90=128
    ln(1/(1-x))+x =0.3
    ln(1/(1-x))+x =5.6
    ln(1/(1-x))+x =176
    arctan0.1w+arctan0.2w+arctan72.08w-arctan4.24w=90
    ln(1/(1-x))+x =0.39298830295807392
    lgx=1.23
    ln(1/(1-x))+x =11.2
    ln(1/(1-x))+x =4
    ln(1/(1-x))+x =364
    ln(1/(1-x))+x=0.1
    x^2-4.46x=0.6455

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