Mathematics
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    arctan(5/(1.837π))
    arctan(5/(18.37π))
    ln(0.070462)
    0.1014*e(-0.364)
    1/7.8
    (1*10^-14)/(7.8*10^-3)
    (10^-14)/(7.8*10^-3)
    0.065-0.0078
    ln(0.70462)
    lg(7.8*10^-3)
    arccos0.74
    arccos-0.92
    792×22
    2021+2020*2022/2021*2022-1
    9减去1加上8乘以4除以2等于
    (2.2935-2.2379)/2.2935
    1.5*(1+2.78*(221)/(1400+221)+0.15)
    14*1.6%+0.7%*150+0.35%*110-0.35%*150-40%*1%*150
    1.5*(1+2.78*(221+80)/(1400+221+80))
    14*1.6%

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