D
dknong


tích phan tù 0 đén ii/4 (tan x . căn bậc 2 (cos x -cos^3x ) ) dx /cos^3x
[TEX] \int_{0}^{\frac{\pi }{4}}\frac{tanx\sqrt{cosx-cos^3x}}{cos^3x}dx[/TEX]
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