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    4t^2+(3-t)^2=17
    0.75*1.5
    20*sin(t^2/35)+0.04*t^3-0.4*t^2-0.96*t
    59270000*ln(1*x)/x=14840
    lnx=-1/2
    2/(x^2+x-2)+1/(x^2+x-4)=1
    2/(x^2+x-2)+1/(x^2+x-4)
    -2(3A-1)≤4(1-2A)
    1/x-2=(1-x)/(2-x)-3
    ((A+1)/4)>A-(1/2)
    (1.3+2x)^2=680000(0.08-x)(0.05-3x)^3
    ((2x^3-x^2+2x)^(1/2))*2=(1-2x)*(3*(2^0.5))
    x^3-12x^2+21x+30=0
    4x^3-38x^2+40x-9=0
    4*(x^3)-38*(x^2)+40*x-9=0
    x^2+78.3x-1566=0
    6666x=5436
    x^3-3x^2+4=0
    2cosx-xsinx=0
    -24x=-4x^(2)

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