arctan(-25.87/49.37)+π
    C(4,1)C(48,3)/C(52,4)
    sin-76
    cos-76
    arctan(4)
    sin30+sin30
    arctan(7.5/4.33）+π
    arctan(-3.54/20.26)+π
    arctan(7.25/12.07)
    arctan（7.25/12.07）+π
    arctan(-3.54/20.26)
    0.8/〖（1+2.7709%）〗^0.98 +1.2/(1+2.7709%)^1.98 +1.8/(1+2.7709%)^2.98 +102/(1+2.7709%)^3.98
    (2√5)²
    C(C(5,3)，C(4,2))
    1.1＋1.91＋1.991＋1.9991＋1.99991＋1.999991＋1.9999991＋1.99999991＋1.999999991
    1＋0.9＋0.8＋0.7＋0.6＋0.5＋0.4＋0.3＋0.2＋0.1 0.1×1.3＋0.2×1.2＋0.3×1.1＋0.4×1＋0.5×0.9 1＋｛[(77×78－6)-5679]÷107＋30｝×37 12－[0.2×(3＋1.5)＋1.1]÷[7.5－(3－2.5)×5]
    3＋36
    4＋27
    5＋25＝
    2/924

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