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    (69×2.5)/(cos13)
    √((2×2.15×247.386×1000)/(1×64.149^3 )×(3.21+ 1)/( 3.21))×2.46×189.8×0.713×0.987
    1.25×7712.856/64.149
    2×1000×247.386/64.149
    √(cos13)
    √((4-1.647)/3 (1-1.553)+1.553/1.647)
    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

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