180-90-arctan(0.5*1.934)-arctan(0.125*1.934)
    180-90-arctan(0.5*0.54)-arctan(0.125*0.54)
    9/10－1/3÷1/2+5/6
    3/8*9/8+8/965
    180-90-arctan(0.5*3.33)-arctan(0.125*3.33)
    180-90-arctan0.5*3.33-arctan0.125*3.33
    180-90+arctan(1.28/0.128)-arctan(0.125*1.28)-arctan(0.5*1.28)-arctan(1.28/0.02184)
    （20+18*3.1+18.4*1.1+（4.633+5.6）*17.6）*0.624-2*10*0.788 =
    180-90+arctan(1.36/0.123)-arctan(0.125*1.23)-arctan(0.5*1.23)-arctan(1.23/0.020172)
    arctan0.836
    arctan0.5614
    arctan0.6666
    180-90+arctan(1.26/0.126)-arctan(0.125*1.26)-arctan(0.5*1.26)-arctan(1.26/0.021168)
    180-90-arctan(0.5*1.55)-arctan(0.125*1.55)
    180-90-arctan(0.5*1.3)-arctan(0.125*1.3)
    180-90-arctan(0.5*1.26)-arctan(0.125*1.26)
    180-90+arctan10-arctan(0.125*1.5)-arctan(0.125*1.5)-arctan(1.5/0.03)
    180-90+arctan10-arctan(0.125*1.29)-arctan(0.125*1.29)-arctan(1.29/0.022188)
    1/0.48-1/1.98
    1/0.99

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