luong giac hoa

N

nguyenbahiep1

bai nay thay em noi dung phuong phap luong giac hoa.........tich phan tu 1 den 3 cua (1/can(4*x-x*x))

[laTEX]I = \int\frac{dx}{\sqrt{4x-x^2}} = \int\frac{dx}{\sqrt{4 -(x-2)^2}} \\ \\ x-2 = 2sint \Rightarrow dx = 2costdt \\ \\ I = \int_{-\frac{\pi}{6}}^{\frac{\pi}{6}} \frac{2costdt}{\sqrt{4cos^2t}} = \int_{-\frac{\pi}{6}}^{\frac{\pi}{6}}dt =?[/laTEX]
 
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