2π-arccos0.2
    arccos0.2
    2^-1
    2^log(½，3)
    log(½，3)
    3+3
    !(67)
    9*267.2*0.01*2.98+11*92*0.01*0.888+11*267.2*0.01*2.98+11*132*0.01*0.888
    sqrt{(1+3/2)*(1+3/2)*[64-4*(38/3)]}
    （3*1160+8*3.14*42.7）/（3*1160-4*3.14*42.7）
    arctan0.036
    arctan0.037
    arctan0.038
    arctan0.040
    sqrt(3-abse)
     arctan0.051
    arctan0.053
    arctan0.055
    arctan0.043
    arctan(0.043)

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