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))
    arctan((20-1/100)/200)
    arctan(2.43/485)
    arctan(485/2.43)
    arctan(485/2.43)
    1-tan60*tan45
    285÷15×5
    tan82
    tan82
    arctan9.5
    arctan3.2
    arctan78
    arctan500

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