tính tích phân

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kimxakiem2507

[TEX]I=\int_{0}^{1}x^2\sqrt{4-3x^2}[/TEX]
mong các bạn giup đỡ mình :d

[TEX]x=\frac{2}{\sqrt3}sint \Rightarrow{I=\frac{16}{3\sqrt3}\int_0^{\frac{\pi}{3}}sin^2tcos^2tdt=\frac{2}{3\sqrt3}\int_0^{\frac{\pi}{3}}(1-cos4t)dt=\frac{2}{3\sqrt3}(t-\frac{1}{4}sin4t)\|_0^{\frac{\pi}{3}}=\frac{2\sqrt3\pi}{27}+\frac{1}{12}[/TEX]
 
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