3850/177.446
    2.290-(0.896+1.727)/2
    arctan(0.5)
    6*sin75
    arctan(1.5)
    tan(1.5)
    arctan4(1/7)
    arctan4(3/4)
    arctan7
    arctan(sqrt(2))
    -11-sqrt(41)
    180+235+180-90+arctan7
    4.4652*0.8=
    (143.9×10^3)/(0.997×4851.9×215)+(0.85×2.4×10^6)/(1.15×401449.28×(1-(0.8×143.9)/370472.45)×215)
    (π^2×2.06×10^5×4851.9)/(1.1×〖4.92〗^2 )
    500/101.70
    (31.1×10^3)/(0.704×574)+(0.115×10^6)/7784
    1.05×1.05×0.5+0
    (0.9×1.5×0.42×0.9×〖1.5〗^2)/10
    (1.7×10^3)/(0.976×1433.3×215)+(1.0×2.2×10^6)/(1.15×49018.52×(1-(0.8×1.7)/5594.92)×215)

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