cos60
    arctan(1.333)+arctan(1.517/1.333)-π/2
    arctan(1.333)+arctan(1.517/1.333)+π/2
    11.491^(1/3)
    11.491^(1/6)
    9^1/2
    9^2
    2^3
    11.491^1/6
    2arctan（√7/7）
    π/2-arcsin（3/4）
    10000000000000000000000000000000000000000000000000000000000000000000000000000000001/68389
    100000000000000000000000000000000000000000000000000000000000000000000000000000000001/3565183
    100000000000000000000000000000000000000000000000000000000000000000000000000000000001/2097307081
    100000000000000000000000000000000000000000000000000000000000000000000000000000000001/7742098247001476863
    1000000000000000000000000000000000000000000000000000000000000000000000000000000000001/603812429055411913
    10000000000000000000000000000000000000000000000000000000000000000000000000000000000001/87211
    1000000000000000000000000000000000000000000000000000000000000000000000000000000000000001/135080726389891
    arctan(0.5*1.74)
    arctan(0.2*1.74)=

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