1/(cos70)^2
    1.523089*0.8829
    150000/(287*343.15)
    (0.4900757^2/(1-0.2*0.4900757^2))^0.5
    2sqrt(36+6.25)
    181.974326*cos70
    2.5*2.5
    171/sin70
    （20+19.4×1.1）×0.704-2×0.839×8
    (117.192-2*11*1.207)/(1.456-0.687)/17.8
    117.192-2×1.207×11
    （20+19.4×3.26+18.5×1.7+17.8×3.14）×0.687
    （20+19.4×3.26+18.7×1.7）×0.687-2×0.829×23
    （20+19.4×3.26+18.7×1.7）×0.564-2×0.751×23
    （20+19.4×3.26）×0.564-2×0.751×23
    （20+19.4×3.26）×0.704-2×0.839×8
    (20 + 19.4 * 1.8)*0.704 - 2*0.839*8
    1137.980085+4.9+15
    1/128(10*(-224/15)+(64-25.6*(-224/15))/13.8)
    (tan(40))^2

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