1814.9/(0.85×0.85)×0.8
    150÷90
    150÷9
    arccos2
    12/5+1/6-7/15
    arctan8.9
    arctan22.25
    arctan22.25
    arctan0.055
    72/3*2
    16967*1.6
    -10lg0.06
    lg0.06
    arctan11.2433364
    arctan1.85876
    arctan0.9762484
    arctan0.54494
    arctan0.68965246
    arctan0.544431
    arctan0.6707325

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