571.3/(1.7×1.7)
    15×(π×16^2)/4
    2×15×(π×16^2)/4
    0.15%×1700×800
    1700×800
    2×15×(π×12^2)/4
    0.15%×1700×1700
    (π×16^2)/4
    (5.48×10^6)/(0.9×360×755)
    1/12×〖0.19〗^2×[(2×1.7+1.7)(2×197.68-(2×1.7×1.7×0.8×24)/(1.7×1.7))]
    1/6×〖0.19〗^2×(2×1.7+1.7)×197.68
    1/12×〖0.19〗^2×[(2×1.7+1.7)(197.68+197.68-(2×1.7×1.7×0.8×24)/(1.7×1.7))]
    (571.3+1.7×1.7×0.8×24)/(1.7×1.7)
    571.3/(1.7×1.7)
    (571.3/1.35+1.7×1.7×0.8×24)/(1.7×1.7)
    0.8×802.55
    0.6×802.55
    0.14×360/1.57×25
    90+arctan(13.77*0.71)-arctan(0.2*0.71)-arctan(0.71)-arctan(81*0.71)
    90-arctan(0.2*2)-arctan(2)

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