1168-50
    1/2*15^2
    (2.181×1.79)/380.857
    （3/2）×3
    (69×2.5)/(cos13.0178)
    (25×2.5)/(cos13.0178)
    acos0.9743
    ((25+69)×2.5)/(2×120.59)
    ((25+69) ×2.5)/(2×cos13)
    (22×(tan30.627-tan20.42) +73×(tan24.123-tan20.42))/2π
    acos0.91267
    ((73×cos20.42)/(73+2×1×cos11.6498))
    acos0.8605
    (22×cos20.42)/(22+2×1×cos11.6498)
    atan0.3723
    (73×2)/(cos11.6498)
    (22×2)/(cos11.6498)
    acos0.9794
    ((22+73) ×2)/(2×cos14)
    1.25×5166.42/27.94

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