acos((69×cos20.483)/(69+2×1×cos13))
    acos((25×cos20.483)/(25+2×1×cos13))
    arctan((tan20)/(cos13))
    arctan(tan20)/(cos13)
    acos0.974376
    1.1771*1.7939
    1.25×10749.6/46.027
    2×1000×247.386/46.027
    46.027/4.036
    (2×1+0.25)×1.7939
    (π×46.027×199.6894)/ (60×1000)
    (1.7939×25)/(cos13)
    (2×1.3×247.3806×1000×0.683×0.801×cos13×cos13)/ (1×25^2) ×0.0108
    (2×1.3×247.3806×1000×0.683×0.801×cos13)/(1×25^2 )×0.0108
    69/(cos13*cos13*cos13)
    (25×(tan29.653-tan20.483) +69×(tan24.35-tan20.483))/ (2π)
    (25×(tan29.653-tan24.35) +69×(tan23.827-tan24.35))/ (2π)
    (25×(tan29.653-tan24.35) +69×(tan23.827-tan24.35))/2π
    acos0.911046
    (69×cos20.483)/(69+2×1×cos13)

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