arccos6/52
    arccos5/52
    -1¾
    1.30176/e
    arctane2-arctane-2
    0.65088*2/e
    arctane2-3.14159265358979323846264338327950288419716939937510/4
    arctane3-3.14159265358979323846264338327950288419716939937510/4
    -4-（-¼+1/18）÷-1/36-19×（71/72）×36
     C(40, 5) * (0.12)^5 * (1 - 0.12)^(40 - 5)
     C(40, 5) * (0.12)^5 * (1 - 0.12)^(40 - 5)
     C(40, 5) * (0.12)^5 * (1 - 0.12)^(40 - 5)
    2×63×0.7×(tan32-tan18)
    2×63×0.7×(tan31.8-tan18.2)
    2×63×0.7×(tan(arccos0.85)-tan(arccos0.95))
    2×63×0.7×（tan(arccos0.85)-tan(arccos0.95)）
    2×63×0.7×（tan(arccos0.85)-tan(arccos0.95)）
    50×（tan(arccos0.85)-tan(arccos0.95)）
    30×（tan(arccos0.85)-tan(arccos0.95)）
    -15-45

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