√(30.47+0.19*52.35)
     (10^(-7) (24.6^2-2.77^2 ))/52+(10^(-10)(24.6-2.77)*7.5)/0.8
    (10^(-7) (68^2-7.77^2 ))/52+(10^(-10)(68-7.77)*7.5)/0.8
    (10^(-7) (66^2-5.52^2 ))/52+(10^(-10)(66-5.52)*7.5)/0.8
    0.002786/1.506972095
    0.004027136-0.001241
    3*3/5
    6400000*(1/cos(0.001328)-1)
    tan89.99999999
    6*(e^(-0.1155*7.8927)-e^(-0.1386*7.8927))
    6*(e^(-0.1155*7.8927)+e^(-0.1386*7.8927))
    340/369
    1/12
    5.25*2/7
    5.25*2*π/7
    7*3/4
    46668.16×3%
    40869.96+832+3600+180+9+1177.2=
    9/8-8940+1233667463224645
    5/6*3

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