Mathematics
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    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
    x^2×(1+x^2)×(1+0.01x^2)=100
    X^2+X-2021=0
    tan2x=-0.6
    (4*ln6+4)*6^8
    433096.37/21850626.14
    21850626.14 - 21417529.77
    864770.571/1.1627 + 1015944.771/(1.1627^2)

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