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4. If $ \left(x^{2}+\frac{1}{x^{2}}\right)-4\left(x+\frac{1}{x}\right)+\frac{23}{4}=0, $ find $ \left(x+\frac{1}{x}\right) $5. If α, β and γ are the roots of the equationx^{3}-4 x^{2}+6 x-4=0, \text { the value of } \frac{1}{\alpha}+\frac{1}{\beta}+\frac{1}{y} is _______ |
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