1/6.420546
    4/0.623
    90-arctan(4)-arctan(4/5)
    2^(-2)-1
    125^(-4)-1
    sin(arctan1)
    3.14*0.175*0.175*886*1.2*0.2*（1/2170+0.35/900/0.05）*1000
    3.14*0.0625*0.0625*3150*1.2*0.2*（1/2170+0.125/900/0.005）*1000
    3.14*0.0625*0.0625*3150*1.2*0.5*（1/2170+0.0625/900/0.005）*1000
    3.14*0.0625*0.0625*3150*1.2*0.2*（1/2170+0.0625/900/0.005）*1000
    3.14*0.0625*0.0625*3150*1.2*0.2*（1/2170+0.0625/900/0.005）
    3.14*0.0625*0.0625*3150*1.2*0.2*（1/2170+0.0625/900/0.005）
    3.14*0.0625*0.0625*3150
    3.14*0.0625*0.0625*1000*3150
    3.14*0.175*0.175*1000*886
    1.2*3.14*0.175*0.175*1000*886*0.2*（1/2170+0.35/900/0.005）
    1.2*3.14*0.175*0.175*1000*886*0.2*（1/2170+0.35/900*0.005）
    1.2*3.14*0.175*0.175*1000*886*0.2
    5.522453/[-0.1996e^(0.38*5.522453)+5.0431]
    5.522453/[e^(0.38*5.522453)+5.0431]

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