arctanx=38.8
    14299.12=3.18*（839.81968*x+2766.6040571*x*x）
    x=0.92*0.99+2.14*0.14
    x=0.92*0.14-2.14*0.99
    x=400*0.93*0.01*2.87*0.2
    x=400*0.4*0.01*2.87*0.2
    x=0.2*(1-0.6*(1-0.26))-0.25*0.2*0.2*0.87
    x=0.010104/2*(2*0.010104/(8*3.14)+(400+(342.6/2)/(6*8000))
    x=0.010104/2*(2*0.010104/(8*3.14)+(400+(342.6/2)/(6*8000))
    x=1/2*(3/4*0.0025*((1-0.33*0.33)/220000+(1-0.077*0.077)/105200)*326)^(1/3)
    x=1/2*(3/4*0.0025*((1-0.33*0.33)/220000+(1-0.077*0.077)/105200)*326)^(1/2)
    x=0.2*(1-0.6*(1-0.26))-0.25*0.2*0.2*0.87
    x∧3－3x＋1＝0
    e∧iπ
    eiπ
    x=248*0.92/0.7
    x=400*(3-0.01*(1+0.96))*0.2/0.96
    cos14=x
    cos14=x
    sin14=x

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