tích phân

N

nguyenbahiep1

[laTEX]I = \int_{\frac{\pi}{6}}^{\frac{\pi}{4}}\frac{tanx}{cos^2x\sqrt{tan^2x+2}} \\ \\ \sqrt{tan^2x+2} = u \\ \\ u^2 -2 = tan^2x \\ \\ udu = \frac{tanxdx}{cos^2x} \\ \\ I = \int_{\sqrt{\frac{7}{3}}}^{\sqrt{3}} du[/laTEX]
 
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