arctan-0.2
    arcsin0.733333
    √ 72
    839414/296.31
    255200+584214=
    48192/4.8%×（1-1/（1+4.8%）^40)×(1/(1+4.8%)^8)
    34910/(4.8%-3.5%)×(1-((1+3.5%)^8/(1+4.8%)^8))
    1-[188*(1-67%)]*(1-50%)/188
    1-[188*(1-67%)]*(1-50%)/209
    188*(1-67%)
    209*(1-67%)
    209-[209*(1-67%)]
    209-(209*67%)
    1-[62.04*(1-50%)]/209
    （0.25）^-3
    3∧π
    arctan(1.4÷0.95)
    arctan(1.4÷0.95）
    arctan1.4
    (2.02*(2.47-2.02))/(2.47*(2.47-2.02))

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