x*sinx=90
    2x*x*x*x+x*x*x+x*x+x+1=0
    x*x*x*x+x*x*x+x*x+x=0
    x^√2
    25 y^2-80 y+9=0
    25 y^2-80 y+9=0
    （5tan(x)-1/sqrt(cos(x))）=3.6
    （5tan(x)+1/sqrt(cos(x))）=3.6
    （5tan(x)+1/sqrt(sin(x))）=3.6
    （5tan(x)+1/sqrt(sin(x))）=3.6
    3/4x^2+2x+1=0
    3x*x-1=-2x
    -4x*x+2=x(1-x)
    x*x+3x-4=0
    x*3*1.66*1.3=3.06
    x*3*1.66*1.3=3.99
    x*3*1.66*1.3=2.7
    X×（√2-√3)X-√6 ÷ X+√2
    4x^3+15x^2+16*x+6
    x(2x-1)=2x-1

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