Mathematics
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    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
    arctan500
    atan104
    atan104
    atan3.2
    arc tan(3676.826778)
    atan20800
    ((2*π*711)*200- 1/((2*π*711)*485))/243

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