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giabaotk123


1.[TEX]\int_{0}^{1} x\sqrt{x^2 +1} dx[/TEX]
2.[TEX]\int_{0}^{\sqrt{3}} x^3\sqrt{1+ x^2} dx[/TEX]
2.[TEX]\int_{0}^{\sqrt{3}} x^3\sqrt{1+ x^2} dx[/TEX]
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