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    b=8.15*sin(78.898609/2)*2
    8.15*π*a-180sin(a)=72*8.15*π b=8.15*sin(a/2)*2
    499x^2-1=0
    32x-32x^2-1=0
    1.05x^2-2.1x+0.05=0
    (x-1)(x-9)(x-6)-48-16(x-9)-9(x-6)-4(x-1)=0
    x^2-7x+5=0
    (1-1/(1+x)^1)/(1-1/(1+x)^50)=0.05614
    abs(1/2X+3)-1<4
    x/1385=6
    x/1385=9
    x/1385=55
    x/1385=555
    x/1385=5
    x/1385=3
    abs(3X-2)<5
    x/2=3
    (814*0.546+x) /(814+x) =0.6
    x*(1+(1+(2*146000*1385*1000/(x*150))))
    x*1385=425

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