arctan-1-arccos-1
    2arctan(3.33/80)=
    2arctan(3.075/60)
    2arctan(3.075/70)
    2arctan(3.33/70)
    1.2×104.5×0.5×0.6
    2arctan(3.73/70)=
    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

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