10*（10^ln10）*ln10
    90+arctan(10/3)+arctan(30/20)-arctan(10)-arctan(5)-arctan(2/3)
    arctan(1/150)
    arctan（（tan2）/√2）
    1-2*0.15%
    1.683/2
    81/64+25/(16*12)+1/96+9/96+49/48
    (89401*299^(134/183)*82000000^(49/183))/551368000000000000000000
    [(7/24)*(-8/5)-3^2]-abs[(1/4)^2+(-17/8/2)]
    -[（1-0.5)^2]*(1/2)*(-3)*[(1/3)*(-1/3)*4]-(-1)^3
    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

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