arctan((1/(100×3.14)-62.8)/200)
    arctan((20×3.14-1/(100×3.14))/200)
    arctan(-(200×3.14×0.4)/200)
    arctan(2.43-485)
    arctan(2.43-485)
    arctan((2.43-485)/200)
    tan((2.43-485)/200)
    tan((485-2.43)/200)
    tan(485-2.43)
    tan(485-2.4.3)
    tan(2.43-485)
    arctan((2.43-485)
    arctan((2.43-485)/200)
    arctan((485-2.43)/200)
    arctan((62.8-1/314)/200)
    tan(-82.2)
    arctan(100×3.14-1/(1000×3.14×0.5))
    arctan(1868/9.32)
    arctan(1868/9.32)
    arctan(200/(20-1/100))

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