33.725ln(x) - 6.2487= 50
    sin(x)+cos(x)=0.2
    sin(x)*cos(x)=-12/25
    （x-1.444）*300-0.2=2
    （x-1.444）*300-0.2=1
    （x-1.479）*300-0.1=1
    s＾4+24s＾3+100s＾2+40s+1389=0
    (x-1.399)*200-0.1=1
    X^2+25X-5850=0
    (x-4.812)*400-0.1=6
    x*x+6x-9
    (1-1/1-x)/x^2/x^-1
    y=cos2*sin2
    y=sin2*tan2
    y=tan3*cos2
    y=cos2-sin2
    11a*a+20a-4=0
    0.75x^(2)-(8 sqrt(3)-3)x+43=0
    x^(2)-(8 sqrt(3)-3)x+43=0
    x^(2)+8 sqrt(3)x+43=0

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