9.55*50+20
    1/2×1.25×〖38.90〗^2×2.0×1.020
    90+arctan(15*0.313)-arctan(2*0.313)-arctan(166*0.313)
    90+arctan(76*1.3)-arctan(2*1.3)-arctan(81*1.3)
    90+arctan(76*1.3)-arctan(2*1.3)-arctan(81*1.3)
    90+arctan(7.7*0.65)-arctan(2*0.65)-arctan(29*0.65)
    90+arctan(15.16*0.65)-arctan(2*0.65)-arctan(57*0.65)
    90+arctan(7.714*0.65)-arctan(2*0.65)-arctan(29*0.65)
    90+arctan(7.714*0.65)-arctan(2*1.65)-arctan(29*0.65)
    90+arctan(7.714*0.65)-arctan(2*0.65)-arctan(29*0.65)
    90+arctan(7.714*0.65)-arctan(2*0.56)-arctan(29*0.65)
    90+arctan(7.14*0.26)-arctan(2*0.26)-arctan(29*0.26)
    90+arctan(13.86*0.76)-arctan(2*0.76)-arctan(126*0.76)
    90+arctan(17*0.574)-arctan(2*0.574)-arctan(78*0.574)
    90+arctan(8.8*0.583)-arctan(2*0.583)-arctan(40*0.583)
    317.55/30.77
    30.77/317.55
    1/sqrt(3)
    1/(2*0.43*sqrt(1-0.43^2))
    90-arctan3.74

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