2×10√(16.9/0.00000014×16.9)
    8215.07-8215.07*6%
    6144.25-6144.25*6%
    15000-(15000*6%)
    16.9/(0.7/0.03456+3.4/(5.72×10^(-4))+0.8/(5×10^(-8)) +4.1/(5×10^(-8)) +1/(5×10^(-8)) +1.6/(1×10^（-4）) +5.3/(1×10^(-4)))
    16.9/(0.7/0.03456+3.4/(5.72×10^-4)+0.8/(5×10^-8) +4.1/(5×10^-8) +1/(5×10^-8) +1.6/(1×10^-4) +5.3/(1×10^-4))
    16.9/(0.7/0.03456+3.4/(5.72×10-4)+0.8/(5×10-8) +4.1/(5×10-8) +1/(5×10-8) +1.6/(1×10-4) +5.3/(1×10-4))
    0.5^2*0.06^2+0.5^2*0.1^2+2*0.5*0.5*1*0.06*0.1=
    arcsin(589.55*10^(-9)/0.00021)
    arcsin(589*10^(-9)/0.00021)
    -63-60
    -63+60
    93.5/450
    (1+9.2%/12*6)
    (1+9.2%/12*6)*(1+0.3%)
    2arcsin(1/18)
    2arcsin(4/9)
    sin(arctan(0.0049/1.1))*0.00041/4
    sin(arctan(4.9/1.1))*0.00041/4
    arctan(4.9/1.1)

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