2x-3x^2＝-40
    2x-3x^2＝-40
    2x-3x^2＝-40
    2x-3x^2＝-40
    2x-3x^2＝-40
    2x-3x^2＝-40
    2x-3x^2＝-40
    2x-3x^2
    e＾x=1/x
    （3+s）∧3=（s＋1）（3s∧2+18s＋27）
    94000x+47000x^2=7820.80
    X-[X/1.03*0.03+X/1.03*0.03*0.12]=124290
    X+2=5
    secx^2-tanx^2=1
    arctanx=2
    arctanx=2
    arccotx=2
    secx-tanx=1/20
    x^x=(1/2)^(1/2)
    sqrt(cscx^2+1)=2

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