arctan(0.19x)-90-arctan(0.2x)-arctan(0.0625x)-arctan(0.012x)=-180
    10^8=1.0*11.9*200x(415-x/2)
    1/u+1/(220-u)=1/56
    144 = x^2((0.04x^2 + 1)((0.0625x)^2 +1))
    x/（x+990.08）=0.0089
    x/x+990.08=0.0089
    arctan(0.012*21.5) = x
    arctan(0.0625*21.5) = x
    arctan(0.2*21.5) = x
    arctan2.4 = x
    -2tanx=2x
    x/tan(66)=(1177.2-x)/tan(38)
    arctan4.085 = x
    x/tan(66)=(1172-x)/tan(38)
    X*(20.7-X)=107.2
    X*(27.4-X)=150.88
    ((50-p)*0.85+3*0.7)/p=0.17
    y=50+25
    0.393*(cos(25.8)*9.81-sin(25.8)*x^2/157)=sin(25.8)*9.81-cos(25.8)*x^2/157
    0.393*(cos(25.8)*9.81-sin(25.8)*x^2/157)=sin(25.8)*9.81+cos(25.8)*x^2/157

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