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)
    arctanπ/4
    2/3*13.8*502400*400*sin(3.14*0.318)^3/3.14+330*12316*346*sin(3.14*0.318)/3.14
    2/3*13.8*502400*400*sin(3.14*0.318)^3/3.14+330*12316*346*1.778/3.14
    165*3/5
    2/3*13.8*502400*400*sin(3.14*0.318)^3/3.14+330*12316*330*1.778/3.14
    2/3*13.8*502400*400*sin(3.14*0.318)^3/3.14+330*12316*330*sin(3.14*0.318)/3.14
    2/3*13.8*502400*400*sin(3.14*0.318)^3/3.14+330*12316*353*sin(3.14*0.318)/3.14

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