4742-4500=
    20/(1+e^(70-61))
    tan(90)=
    tan90=
    155/(1000*0.029*2.5)
    306*34=
    （cos（15）* 0.5*2^0.5）^2
    cos（15）* 0.5*2^0.5
     226.98006922186256147892598444194-71*π
    -226.98006922186256147892598444194+73π
    -226.98006922186256147892598444194/π
    e^(0.5/1.38*10^23)
    arcsin0.2229
    3058.962763/（（3200-3058.962763）×(36800-2×3058.962763)＾2）
    90-arctan(0.2*0.834)-arctan(0.0625*0.834)-arctan(57.143*0.834)+arctan(10*0.834)
    90-arctan(0.2*0.834)-arctan(0.0625*0.834)-arctan(57.134*0.832)
    sin15.368
    1.264/0.528
    e^(-1)
    173/146

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