（2.7922*0.2^2-2.492376978*0.2+1/0.996*0.81x/179.98)^2.4+(0.8x/164.83)^2=1
    （3.506316885*0.2^2+3.129724654*0.2+1/0.996*0.81x/240.9877669)^2.4+(0.8x/240.8339042)^2=1
    （-3.506316885*0.2^2+3.129724654*0.2+1/0.996*0.81x/240.9877669)^2.4+(0.8x/240.8339042)^2=1
    （-3.506316885*0.2^2+3.129724654*0.2+1/0.996*0.81x/179.9877669)^2.4+(0.8x/240.8339042)^2=1
    （-3.506316885*0.2^2+3.129724654*0.2+1/0.996*0.81x/179.9877669)^2.4+(0.8x/200.8339042)^2=1
    （-3.506316885*0.2^2+3.129724654*0.2+1/0.996*0.81x/179.9877669)^2.4+(0.8x/164.8339042)^2=1
    （-3.506316885*0.2^2+3.129724654*0.2+1/0.996*0.81x/179.9877669)^2.4+(0.8x/164.8339042)^2=1
    300/x=300/1.5x+0.5
    300/1.5x-300/x=0.5
    300/x-450/x=0.5
    sqrt(2-sqrt(2+x))=x
    2-x=2*x*x+x*x*sqrt((2+x))
    1/(1+exp(−(2b0)))=1/2
    arctan(3.49x)-arctan(0.2x)-arctan(0.0625x)=0
    arctan(3.49x)-arctan(0.2x)-arctan(0.0625x)=0
    arctan(3.49x)-arctan(0.2x)-arctan(0.0625x)=90
    arctan(3.49x)-arctan(41.5x)-arctan(0.2x)-arctan(0.0625x)=-90
    -arctan(0.2x)-arctan(0.0625x)=-40
    arctan(0.2x)-arctan(0.0625x)=-40
    xtanx=4.285714286

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