x*x+6x-9
    (1-1/1-x)/x^2/x^-1
    y=cos2*sin2
    y=sin2*tan2
    y=tan3*cos2
    y=cos2-sin2
    11a*a+20a-4=0
    0.75x^(2)-(8 sqrt(3)-3)x+43=0
    x^(2)-(8 sqrt(3)-3)x+43=0
    x^(2)+8 sqrt(3)x+43=0
    0.15-2*x/(2037.4*9.80665)*(1-ln(2*x/(2037.4*9.80665*0.15)))-0.07162
    0.15-2*x/(2037.4*9.80665)*(1-ln(2*x/(2037.4*9.80665*0.15)))-0.07862
    0.15-2*x/(2037.4*9.80665)*(1-ln(2*x/(2037.4*9.80665*0.15)))-0.07262
    0.15-2*x/(2037.4*9.80665)*(1-ln(2*x/(2037.4*9.80665*0.15)))-0.07294
    0.15-2*x/(2037.4*9.80665)*(1-ln(2*x/(2037.4*9.80665*0.15)))-0.07278
    0.15-2*x/(2037.4*9.80665)*(1-ln(2*x/(2037.4*9.80665*0.15)))-0.07762
    0.15-2*x/(2037.4*9.80665)*(1-ln(2*x/(2037.4*9.80665*0.15)))-0.07732
    0.15-2*x/(2037.4*9.80665)*(1-ln(2*x/(2037.4*9.80665*0.15)))-0.07602
    0.15-2*x/(2037.4*9.80665)*(1-ln(2*x/(2037.4*9.80665*0.15)))-0.06176
    2x-6/x=-3/x

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