arctan32
    -630-550=
    C(6,0)*0.2∧0*0.8∧6
    C(22,7)*0.2∧7*0.8∧15
    C(22,6)*0.2∧6*0.8∧16
    C(22,5)*0.2∧5*0.8∧17
    C(22,4)*0.2∧4*0.8∧18
    C(22,3)*0.2∧3*0.8∧19
    C(22,2)*0.2∧2*0.8∧20
    C(22,0)*0.2∧0*0.8∧22
    C(22,1)*0.2∧1*0.8∧21
    8+8*（8-8）/8
    8+8*（8-8）/8
    arctan10-arctan0.1
    arctan1-arctan0.01
    18240/(0.12%)×[1-1/(1+0.12%)^40 ]
    -arctan2-arctan0.4
    arctan10-arctan0.1
    -arctan0.1
    -arctan0.1

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