52.8/27022800000000
    4×2.1×10^5×32170000
    90-arctan(0.047*55)-arctan(0.03*55)
    90+arctan(0.5*12)-arctan(10*12)-arctan(0.047*12)-arctan(0.03*12)
    90+arctan(0.05*112)-arctan(0.1*112)-arctan(0.0047*112)
    90+arctan(0.05*125)-arctan(0.1*125)-arctan(0.0047*125)
    1/e^2
    （1-exp（-0.373）
    0.009705+0.5
    2/3+（-2）
    sin11
    365/7
    1/0.165738
    4.16/sqrt(6)/sqrt(7)/sqrt(15)
    0.645^2
    1.732051*5
    1+√2
    ln2/-0.0077
    arctan5.6174
    arctan5.31

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