ln(2a)=(4-2a)^(1/3)
    4-(lnx)^3=x
    4x^3+24x^2-32x=0
    4x^2+24x-32=0
    (a－18)(320－10a)=400
    10a^2+400a+6160=0
    10a^2+400a+6160=0
    10a^2+400a+6160=0
    10a^2+400a+6160=0
    10a^2+400a+6160=0
    10a^2+400a+6160=0
    10a^2+400a+6160=0
    10a^2+400a+6160=0
    x*0.786151+arctan0.786151=2*arctan1
    √（w^2+1）/（w^3+w）=1
    3x^2+24x+32=0
    cos(134)=(3600+146.03^2-x^2)/(120*146.03)
    x^2=3ln(x+1)
    x^4-4x^2+3 = 0
    x^4-4x^2-1=0

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