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kunkun2410


[tex]\int\limits_{0}^{2}sqrt{4-x^2}dx[/tex] [TEX](x=2sint)[/TEX]
[tex]\int\limits_{0}^{1}\frac{1}{e^{2x}+3}dx[/tex][TEX](x=e^{2x})[/TEX]

[tex]\int\limits_{0}^{1}\frac{1}{e^{2x}+3}dx[/tex][TEX](x=e^{2x})[/TEX]
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