180-90-arctan(0.5*1.28)-arctan(0.125*1.28)
    80-90-arctan(0.5*1.28)-arctan(0.125*1.28)
    180-90-arctan(0.5*1.029)-arctan(0.125*1.029)
    3298e/34
    21e/34
    (1-sqrt(1.996))/0.498
    180-90+arctan(1.934/0.1934)+arctan(1.934/1.16)-arctan(0.5*1.16)-arctan(0.125*1.934)-arctan(1.934/0.034)-arctan(1.934/3.23)
    180-90+arctan(1.934/0.1934)+arctan(1.934*1.16)-arctan(0.5*1.16)-arctan(1.125*1.934)-arctan(1.934/0.034)-arctan(1.934/3.23)
    2000/0.0006
    6/5÷15
    6/5/15
    2/3*14.3*1000*3.14*0.2*0.2*0.4*sin（0.416*3.14）*sin（0.416*3.14）*sin（0.416*3.14）
    2/3*14.3*1000*3.14*0.375*0.375*0.4*sin（0.416*3.14）*sin(0.416*3.14)*sin(0.416*3.14）/3.14
     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)

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