arccos((24+95)/120)
    1.02*1.4*1.308
    1.3+0.23*10^(-3)*35.64
    7722651/（1+2.1%）=
    6015600/（1+1.9%）=
    ((2*56700)*((95/24+1)/(95/24))*((2.442*189.8*0.638*0.987/517)^2))^(1/3)
    ((2*56.7)*((95/24+1)/(95/24))*((2.442*189.8*0.638*0.987/517)^2))^(1/3)
    (((4-1.735)/3)*(1-1.764)+1.735/1.764)^0.5
    (((4-(1.88-3.2*(1/24-1/95))*cos(13))/3)*(1-（24*tan(13)/π）)*((1.88-3.2*(1/24-1/95))*cos(13)/（24*tan(13)/π）))^0.5
    ((4-(1.88-3.2*(1/24-1/95))*cos(13)/3)*(1-（24*tan(13)/π）)*((1.88-3.2*(1/24-1/95))*cos(13)/（24*tan(13)/π）))^0.5
    (((4- (1.88-3.2*(1/24-1/95))*cos(13))/3)*(1-24*tan(13)/π)*( (1.88-3.2*(1/24-1/95))*cos(13)/（24*tan(13)/π）))^0.5
    24*tan(13)/π
    [1.88-3.2*(1/24-1/95)]*cos(13)
    (2*cos(arctan(tan(13)*cos(arctan(tan(20)/cos(13)))))/(cos(arctan(tan(20)/cos(13)))*sin(arctan(tan(20)/cos(13)))))^0.5
    (2*cos(arctan(tan(13)*cos(arctan(tan(20)/cos(13)))))/(cos(arctan(tan(20)/cos(13)))*sin(arctan(tan(20)/cos(13)))))^0.5
    arctan(tan(13)*cos(arctan(tan(20)/cos(13))))
    arctan(tan(13)*(arctan(tan(20)/cos(13))))
    arctan(tan(20)/cos(13))
    sin30
    arctan（tan(13)*cos(arctan(tan(20)/cos(13)))）

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