sin（180/π)
    4.3/3×(2×48.6378+183.1873)/(48.6378+183.1873)
    1/2×(48.6378+183.1873)×4.3
    6.2/3×(2×66.5724+138.8568)/(66.5724+138.8568)
    1/2×(66.5724+138.8568)×6.2
    20+2.1×17+3×18.5+2.5×18.6+6.2×19.1-2×12×0.6494
    -2×12×0.6494
    20+2.1×17+3×18.5+2.5×18.6+6.2×19.1
    20+2.1×17+3×18.5+2.5×18.6
    1/2×(48.6378+112.4709)×2.04
    1/2×(66.5724+112.4709)×（1.9+2.04）
    2.04/3×(2×48.6378+112.4709)/(48.6378+112.4709)
    1/2×(48.6378+112.4709)×0.91
    (1.9+2.04)/3×(2×66.5724+112.4709)/(66.5724+112.4709)
    1/2×(66.5724+112.4709)×0.91
    19.1×2.04×1.6383+2×19×1.2799
    (20+137.7)×0.6104-2×19×0.7813
    2.1/3×(2×9.4617+37.4055)/(9.4617+37.4055)
    0.91/3×(2×48.6378+77.1115)/(48.6378+77.1115)
    0.91/3×(2×66.5724+77.1115)/(66.5724+77.1115)

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