Mathematics
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    [20+2.1×17+3×18.5+2.5×18.6+6.2×19.1+19.5×(14.5-4.3)]×0.4217-2×12×0.6494
    arcsin0.5
    sin(630/π)
    sin(450/π)
    sin(270/π)
    sin(90/π)
    sin(540/π)
    sin(360/π)
    sin(180/π)
    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)

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