[ Toán 12] Tính tích phân

N

nguyenbahiep1

1. [TEX]I= \int_{0}^{1} sin^5 \pi x dx[/TEX]

[laTEX]I= \int_{0}^{1} sin^4(\pi.x).sin(\pi.x) dx = I= \int_{0}^{1} (1-cos^2(\pi.x))^2 sin(\pi.x) dx \\ \\ cos(\pi.x) = t [/laTEX]
 
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