C(2,49)
    C(2.49)
    A(49,2)
    C(49,2)
    lg0.05
    √-2
    √-1
    (ln(1+1/100^2))-(1+100^2)^(1/2)+100
    1-3/7
    lg36
    1/6*6/25^2-0.04*6/25
    -arctan3
    -9÷（-84/33）
    e^(π)
    e^(-π)
    e^[-0.707π/((1- 0.707^2)^1/2)]=
    e^[-0.707π/(1- 0.707^2)^1/2]=
    3*（15-2）+30
    2.7*15+27
    arctan0.002

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