bài này nghe đơn giản mà nghĩ mãi k ra

N

nguyenbahiep1

thật sự rất đơn giản

[laTEX]\int_{0}^{\frac{\pi}{2}}\frac{sin^2(\frac{x}{2})dx}{cos^2(\frac{x}{2})} \\ \\ \\ \int_{0}^{\frac{\pi}{2}}tan^2(\frac{x}{2})dx \\ \\ \int_{0}^{\frac{\pi}{2}}( tan^2(\frac{x}{2})+1)dx - \int_{0}^{\frac{\pi}{2}}dx \\ \\ \int_{0}^{\frac{\pi}{2}}\frac{dx}{cos^2(\frac{x}{2})} - x \big|_0^{\frac{\pi}{2}} \\ \\ (2tan(\frac{x}{2})-x )\big|_0^{\frac{\pi}{2}}[/laTEX]
 
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