arctan5/8.66
    arctan5/8.66
    42/30÷7
    4/5÷6
    arctan220/110
    arctan220/110
    arctan(1/3)
    arctan2
    arctan(4/3)
    arctan(4/3)
    log0.82(4285)
    arctan(1/3)
    arctan(1/3)
    arctan1
    678/43
    1+2
    √114514
    arctan3
    arctan3
    0^（-1/3）

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