arcsin(2^0.5*340*sin4.96/194.35)
    arcsin(520/668.88*sin100)
    (520^2+340^2-2*520*340*cos100)^0.5
    arcsin(38/42)
    296.08+284.23+272.34+260.41+248.43+236.42+224.36
    9-1.8*1.8
    65536*32768-1
    65536*32768
    0.005/47.1
    0.005/41
    （5*42+1*5+3*4）/（42+5+4）
    （2+3.15+5.87）*（3.15+5.87+7.32）-（2+3.15+5.87+7.32）*（3.15+5.87）
    49-1250÷4
    1.35/1.36
    4.5/0.68
    3.5/0.68
    e^(-1.813799)
    -3.1415926/1.732051
    -π/1.732051
     e^(-π/(2*(1-0.25)^0.5))

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