cos36*cos72*cos108*cos144
    cos36+cos72+cos108+cos144
    sin0.827460584255555
    sin47.41
    arctan1.088
    (671+1200)/(1/1.12-0.22)*1.1*5*1.4
    671/(1/1.12-0.22)*1.1*5
    671/(1/1.12-0.22)*1.1
    999^999
    999^999
    (67.06+5*25)/(14+25)=
    (67.06+5*20)/(14+20)=
    (67.06+5*18)/(14+18)=
    (67.06+5*14)/(14+14)=
    (67.06+5*10)÷（14+10）=
    arccos0.235702479
    18.16×0.6=
    [1-6.67/（6.67+33.33)×（1-0)]×100%
    1023039389*1954958940491
    846×[（1+0.0435）-1]+（80+27.78）×[（1+0.0435）^0.5-1]

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