arctan(sqrt(11.5/9-1))
    arctan(sqrt(11.5/9)-1)
    sqrt（-9）
    3.14*17*17*10
    28.9*28.9*10
    28*28*10
    3.1415927*17.140741*17.140741*10
    17.140741*17.140741*10
    28.989795*28.989795*10
    !(100)
    2^29
    0.5*(1-0.9981287)
    50×(50+50×25)=
    (1-0.745355619821841)/(1-0.95578)
    (1-0.95578)/(1-0.745355619821841)
    1/(1-0.745355619821841)
    0.5*(1-0.745355619821841)
    [1-(1/1.5)^2]^0.5
    0.5*(1-0.916515138991168)
    [1-(1/2.5)^2]^0.5

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