2arctan(4/60)=
    e
    4*（lnsin1*sin1+cos1）
     5^7
    arctan79618
    arctan79618
    arctan79618
    arctan1/0.00314
    arctan1/0.00314
    arctan1/0.00314
    arctan1/0.00314
    arctan1/0.00314
    arctan1/0.00314
    【3000*678/（1+3%）】*3%+【1130/（1+3%）】*3%+2000*800*80%*3%+12000*3%
    log(0.9772,0.01)
    log(0.01,0.9772)
    136[13+9*150000000]
    136[13+9*100000000]
    log（3，4）
    104.5×0.5×0.6

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