90-arctan(0.2*2)-arctan(2)
    90-arctan(0.2*0.78)-arctan(0.78)
    90-arctan(0.2*0.78)-arctan(0.78)
    e^(-0.5*3.14/(sqrt(1-0.25)))
    90+arctan(2.5)-arctan5-arctan0.4
    (1.1×20.67×10^6)/266666.67
    (206.7×0.4)/4
    826.8/4
    √((36.88/1.22)^2+〖2.38〗^2 )
    (22.3×10^3)/9369.5
    (34.5×10^6)/948000+(4.6×10^3)/9369.5
    7×1338.5
    1.2×18
    1.5√18
    (27.8×10^6-0.4×9.1×10^3×300)/(0.4×1.0×0.78×300×300)
    (18.1×10^3-0.3×9.1×10^3)/(1.0×0.47×300)+(27.8×10^6-0.4×9.1×10^3×300)/(1.3×1.0×0.78×300×300)
    0.4×9.1×0.3
    0.5×16.7×500×500
    (22.3×10^3)/(0.8×0.78×300)+(34.5×10^6)/(0.4×1.3×1.0×0.78×300×300)
    (22.3×10^3)/(0.8×0.78×300)+(434.5×10^6)/(0.4×1.3×1.0×0.78×300×300)

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