arctan0.2
    arctan5
    arctan5
    arctan20
    arctan0.2
    arctan90
    arctan0.15
    arctan2
    arctan5
    arctan0.2
    arctan1.2
    100/11
    -90-arctan(sqrt12)-arctan(1/4*sqrt12)
    sin5/8
    sin5/8
    90-arctan0.2-arctan(1/4*0.2)+arctan10-arctan500
    0.2/11
    arctan0.48
    arctan2.89
    9.8/9.8/3.1/0.8

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