2.2/(1+1%)^4=
    arctan(((tan20)*(tan40))/tan10)
    arctan(((tan20)*(tan40))/tan10)
    ((tan20)*(tan40))/tan10
    tan20*tan40/tan10
    tan20*tan40/tan10
    tan20*tan40/tan10
    (16.79×596^4)/(100×2.56×10^10 )
    (0.75×10^6)/(5.1×10^3 )
    1/8×16.79×〖0.596〗^2
    27.98×0.596
    (23.76×10^3)/(0.75×489)+(0.22×10^6)/(5.1×10^3 )
    (26.78×10^3)/(0.75×489)+(0.22×10^6)/(5.1×10^3 )
    (0.9×1.4×0.64×1.2×〖1.5〗^2)/10
    (26.78×10^3)/(0.75×489)+(0.16×10^6)/(5.1×10^3 )
    [1.2×(3+5+0.15)+0.9×1.4×(3.0+2.0+2.0)]×1.2×1.2
    28.19×1000/(0.75×4.89×10^2)
    [1.2×(3+5+0.15)+1.4×(3.0+2.0+2.0)]×1.2×1.2
    (23.76×10^3)/(0.75×489)+(0.16×10^6)/(5.1×10^3 )
    (0.9×1.4×0.64×0.9×〖1.5〗^2)/10

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