arctan(-1)
    0.73×1/2×2^2×3.05
    0.82×2.5
    20+7+5+3+2.5+3+1
    251889.17*160*2800/543000/160
    251889.17*475*200/543000/200
    251889.17*475*200/145400/200
    （475×30+2800×18）
    86555.11*160*2800/145400/160
    86555.11*475*200/145400/200
    115.95+95.00+39.5+8.83+20.04+44.69
    （115.95+95.00+39.5+8.83+20.04）×16%
    （115.95+39.5+95.00）×8%
    （115.95+39.5）×1×4.35%+95.00×1×0.5×4.35%
    arcsin9
    arctan1
    arcsin1.5π
    arcsin1
    arcsin2
    arcsin50

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