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    e^i+e^(-i)=0
    100/3x=50/3x+200
    x^3-6×x^2+5×x-1=0
    4x²-1=0
    i-13%/14%-13%=5-5.1317/4.9464-5.1317
    (1- x²)²/(1-x²)²
    (1- x²)²÷(1-x²)²
    (1+ x²)²÷(1-x²)²
    (1+ x²)²÷(1-x²)²
    X*10%+X=1408
    1/d+2/d+2=0
    x^3+5*x^2+8*x+3
    2^x=10^x
    ½x=(x-1)(x+1)
    X+2=½x
    X+2=½x
    X+2=½x
    2x*x*x-8x*x+12x-5=0
    2x*3-8x*2+12x-5=0
    a^5+5a^3+5a=18

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