Mathematics
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    193/(1+15%)/(1+15%)/(1+15%)=
    193/(1+25%)/(1+25%)/(1+25%)=
    219/(1+25%)/(1+25%)/(1+25%)=
    219/(1+15%)/(1+15%)/(1+15%)=
    15*15
    2x+1
    arccos(0.87)
    arccos(0.906)
    arctan(0.906)
    ln(-1.1136*10^(-5)x=8*10^(-3)
    123456789987654321tan(180/123456789987654321)
     X/50-3 = X/60+2
    X/3150+x/1000=1
    x(0.4+x)/(0.4-x)=1.2*10^-2
    x-sinx=3.1415926*0.4
    x-sinx=72
    x+sinx=72
    x+sinx=72
    3+x
    x^2×(1+x^2)×(1+0.01x^2)=19.1×19.1

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