12∧（n-1）-11n*（n-1）
    x^6-2×20^4×x^2-20^6
    x²sinx
    5010+0.08x+450=x
    99.7*（1+r)=30.4/r
    tan(45-x/2)/tan(45+x/2)=0.0444^0.5
    x（e^x-2）=0
    -arctanx-arctan2x=-π/2
    -arctanx-arctan2x=-π
    0.137X^-3+0.119X^-2+0.267X^-1-0.019=0.43
    0.137X^-3+0.119X^-2+0.267X^-1-0.019=0.17
    s(s+2)(s+4)+1＝0
    s(s+2)(s+4)＝0
    0.137X^-3+0.119X^-2+0.267X^-1-0.019=0.9872
    0.137X^-3+0.119X^-2+0.267X^-1-0.019=0.99
    0.137X^-3+0.119X^-2+0.267X^-1-0.019=0.8884
    0.137X^-3+0.119X^-2+0.267X^-1-0.019=0.5923
    0.137X^-3+0.119X^-2+0.269X^-1-0.019=0.44
    0.137X^-3+0.119X^-2+0.269X^-1-0.019=0.9872
    0.137X^-3+0.119X^-2+0.269X^-1-0.019=0.89

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