X+1870/2400X=630500
    66000＝27x-0.0035x^2
    66000＝-0.0035x^2+27x
    66000＝-0.0035x^2-27x
    66000＝0.0015x^2-27x
    1-a/(1.66+a)+1/6.283sin(6.283a/(1.66+a)) = 1/(2*1.77746)
    1-a/(1.66+a)+1/6.283sin(6.283a/(1.66+a)) = 1/(2*1.850667)
    1-a/(1.66+a)+1/6.283sin(6.283a/(1.66+a)) = 1/(2*2.376879)
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*1.850667)
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*2.376879)
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*2.376879)
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*1.850667)
    x*0.86*4=3.48
     x*0.86*1.3=3.48
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*1.77746)
    1/6000=x/5000
    3x=18
    x = -(5000000*1.3624-7146200)/327949
    xtan(x)=2.83
    xtan(0.75x)=2.83

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