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vodoi1432


[TEX]\int_{1}^{(1+\sqrt{5})/2}\frac{x^2+1}{x^4-x^2+1}[/TEX]
[TEX]\int_{1}^{sqrt{3}}\frac{x^2+1}{x^4+x^2+1}[/TEX]
[TEX]\int_{1}^{sqrt{3}}\frac{x^2+1}{x^4+x^2+1}[/TEX]
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