Mathematics
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    1/1.0087*101.325/(500+101.325)*(20+273.15)/293.15*500
    15*20-89
    18.09+8.314*373*(10^-3)*ln(0.1^4)
    18.09+8.314*373*(10^-3)*ln(0.1*0.1^3/0.1^2)
    5*2.028754*sin(2.028754)
    12×2.4-2(2.4+5)
    7×5^2-5^2+5×0.6
    7×√5-√5+5×0.6
    34*(tan(13.05963)-tan(12.942553))
    arcsin(sin(24/1.8))
    39*(tan(21.72)-tan(21.1))
    34*(tan(13.06)-tan(12.94))
    arcsin(sin(24)/1.816)
    arcsin(sin(24)/1.8)
    -4.6×4+17.2
    (0.3×0.1-0.107×0.2)/0.5
    1/(-0.5)×(0.3×0.1-0.107×0.2)
    1/(-0.5)×(0.3×0.1-0.107×0.3)
    -4.6+4×2.1
    0.107×0.3-0.3×0.1

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