arctan(0.04×20)=
    arctan(0.1×165)=
    arctan(0.001×165)=
    arctan(0.1×84.1)=
    arctan(0.001×84.1)=
    arctan0.1×84.1=
    arctan0.1×84.1=
    arctan0.001×84.1=
    arctan0.001×841＝
    6-8/5
    (4×0.01645)/(π (20/1000)^2 )
    19.5×0.62=
    9.09×0.62=
    cos180
    arcsin3/5
    49.71×π/4 (〖0.025〗^2-〖0.02〗^2)/(π×0.025×0.0025)
    2.598+47.11
    2.812+94.22
    97.498-39.53
    (39.53-25)×5×1.112×10^(-5)

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