arctan(1/(0.04*34^(1/2)))*180/3.14
    arctan(1/(0.04*34^(1/2)))
    3/8*0.32
    1/10÷0.1
    9.23-3%
    0.33*20
    1/20*4.6
    0.47*1/5
    3/4-0.25
    arctan(1/(0.4*34^(1/2)))
    4454/5467+5445/464577+66/23
    634533+5
    244+345+34+53+4153+4+53+43+453+4+53+45
    lg0.000000875
    lg8.75^-10000000
    10^-9.26
    10^9.26
    lg0.0019
    e + 1
    -lg0.0132

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