4x+1=0
    p^2/6+0.2*p+1=0
    lnx*(x+1)-x+1=0
    lnx*(x+1)-2*x+2=0
    （6x0.0000001）÷(2xsin(0.0001)x1.8×0.001)
    sinx＝0.00005
    lnx(x+1)-3*x+3=0
    2n*n-4n-23=120
    sin（x）=0.253
    （cosx）^3－2×（sinx）^2×cosx
    （cosx）^2×sinx
     arctanx+arctan5*x = π/3
    arctanx+arctan5x = 60
    arctanx+arctan5x=π/3
    arctanx+arctan5x=60
    x/（x^2＋4）^2
    x/（x^2＋4）^3/2
    arctanx+arctan5x=60
    x/（x²＋4）^（3/2）
    x/20+x/30+x/42=3

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