e^7.962
    e^8.096
    e^7.76
    e^7.771
    e^8.015
    ln8.015
    0.21*14.7*502654.82*0.68-0.62*360*4022
    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

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