tanx=0.7071
    0.101*(1-exp(-1.1*x))*44.6*1000*3.14/4*x^2 = 10.8
    0.101*(1-exp(-1.1*x))*44.6*1000*3.14/4*x^2 = 26.2
    0.101*(1-exp(-1.1*x))*44.6*1000*3.14*x^2 = 26.2
    0.101*(1-exp(-1.1*x))*44.6*1000*3.14/4*x^2 = 26.2
    0.101*(1-exp(-1.1*x))*44.6*1000*3.14/4*x^2 = 36.4
    0.101*(1-exp(-1.1*x))*44.6*1000*3.14/4*x^2 = 83.4
    0.101*(1-exp(-1.1*x))*44.6*1000*3.14*x^2 = 83.4
    sinx=0.414
     arctan x + arctan（ x * 6 ）+ arctanx=90
     arctan x + arctan（ x * 6 ）=90
     arctan x + arctan（ x * 3 ）=90
     arctan x + arctan（ x * 2 ）=90
     arctan x + arctan（ x * 2 ）=90
    arctanx=54.735
    tanx=54.735
    arctanx+arctan2x=π/2
    arctanx+arctan2x = π/2
    arctanx+arctan2x = π/2
    arctanx+arctan2x = π/2

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