C(4,7)
    e^6+2e^4-2e^3-4e^2+1
    A(4,7)
    A(4,6)
    e^6+2e^4-2e^3-4e^2+1
    A(4,5)
    A(4,4)
    !(!(4))
    10-18
    1-sin42sin42
    -0-0
    2^100000000000000000
    √27×27
    5/7-5/9×5/7
    [ 4×1605.74 / (3600×3.14×0.4×749.677) ] ^0.5 =
    (1+sin42)/(1-sin42)
    0.2*(100000-1000)^(2/3)+0.2*(100000-800)^(2/3)+0.3*(100000-200)^(2/3)+0.3*100000^(2/3)
    arctan32
    78.89%+14.17%
    76.03%+3.86%

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