50cos72
    1÷15
    ln0.4＝
    70÷2+70 =
    75÷2+75 =
     7863783781983819*37829483772772
    √12
    2arctan(4/10)
    2arctan(0.04/100)
    arctan(-7.33)
    arctan(-7.33)
    arctan(-7.33)
    ［2046×（1+0.0518）×1.0796+0］×0.9910
    ［1-1/（1+6.50%）^61.26］/［1-1/（1+6.50%）^70］
    2arctan0.0004
    2arctan0.004
    2arctan4/1000
    0.0015*1000*1445
    1419.403/（1000*1445）
    （19.1*1000*0.0216*1445）/420

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