180+arctan(0.4*3.9)-90-arctan(0.2*3.9)-arctan(0.5*3.9)-arctan(0.08*3.9)
    180+arctan(0.4*52.759)-90-arctan(0.2*52.759)-arctan(0.5*52.759)-arctan(0.08*52.759)
    6/(sqrt(10)*sqrt(0.04*10+1)*sqrt(0.25*10+1))
    180-90-arctan(0.2*2.9)-arctan(0.5*2.9)
    180-90-arctan(0.2*4.08)-arctan(0.5*4.08)
    90-arctan(0.2*4.08)-arctan(0.5*4.08)
    arctan(sqrt(2))
    arctan(sqrt(2))
    arctan(sqrt(2))
    arctan0.5
    arctan2
    arccos0.767
    2*sqrt(0.2*0.2+2*2)/0.2
    arctan(1/8)
    √(〖(35.1/347.2)〗^2+〖(105.2/560)〗^2 )
    (42.06×0.1)/(〖0.1〗^2×4)
    140.2/4
    √(〖16.9〗^2+3×〖20.8〗^2 )
    (140.2×10^3×941600)/(317419696×20)
    (140.2×10^3×1173585.8)/(317419696×20)

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