arctan(-1.732/2)
    -arctan(-66/63)-arctan(-66/113)
    ln(1+0.04)
    10000000+8869204.300007
    0.886920430000716*10000000
    e^(-0.12)
    1000*e^(-0.12)
    360-75-60-130
    0.35/0.04/0.8
    e3 22
    e^2.4
    e^1.8
    e^1.2
    e^0.9
    e^0.6=
    (4.47*sqrt(4.47^2+4)*sqrt(4.47^2+100))/200
    90-arctan(4.1/2)-arctan(0.41)
    2arctan(0.0001/0.29/2)=
    2arctan(0.0001/0.58)=
    2arctan(0.0001/2/0.29)=

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