1. $\int\limits_{0}^{\frac{\pi}{2}}sin2x\sqrt{cosx}dx$

2. $\int\limits_{0}^{\frac{\pi}{2}}e^{sin^{2}x}sinxcos^{3}xdx$ 

3. $\int\limits_{0}^{\frac{\pi}{2}}\sqrt[10]{1-cos^{5}x}sinxcos^{9}xdx$

4. $\int\limits_{ln2}^{ln5}\frac{dx}{(10e^{-x}-1)\sqrt{e^{x}-1}}$ 


5. $\int\limits_{\frac{3\pi}{4}}^{\frac{\pi}{4}}(tan^{2}x-tanx)e^{-x}dx$

6. $\int\limits_{\frac{-1}{2}}^{0}\frac{dx}{1+\sqrt{-x(1+x)}}$ 

7. $\int\limits_{-1}^{1}\frac{dx}{1+x+x^{2}+\sqrt{x^{4}+3x^{2}+1}}$ 

8. $\int\limits_{2}^{4}\frac{\sqrt{ln(9-x)}}{\sqrt{ln(9-x)}+\sqrt{ln(3+x)}}dx$ 

9. $\int\limits_{\frac{\pi}{6}}^{\frac{\pi}{4}}\frac{cos^{2}x}{sin^{3}xsin(x+\frac{\pi}{4})}dx$ 

10. $\int\limits_{0}^{3ln2}\frac{dx}{(\sqrt[3]{e^{x}}+2)^{2}}$ 

11. $\int\limits_{1}^{e}\frac{ln^{2}x+lnx}{(lnx+x+1)^{2}}dx$ 

12. $\int\limits_{ln2}^{ln3}\frac{e^{2x}dx}{e^{x}-1+\sqrt{e^{x}-2}}$ 

13. $\int\limits_{0}^{1}\frac{dx}{\sqrt[5]{(1+x^{5})^{6}}}$ 
 
câu cuối cung bạn hãy vào 'toán học tưởi trẻ'số 395 để xem cách giải tỏng quát nha.//.. –  nhutuyet12t7.1995 15-01-13 07:38 PM
Đề nghị bạn khi lần sau đăng câu hỏi thì Mỗi một phần chỉ dc đặt 1 câu hỏi thui nhé, không đặt nhìu câu hỏi trong 1 phần thế này.thanhk. BQT –  hoàng anh thọ 12-01-13 10:43 AM
1) $Sin2x\sqrt{Cosx}dx= 2SinxCosxCos^\frac{1}{2}dx=-2Cosx^\frac{3}{2}d(Cosx)$ tp cơ bản .
ta có :$\int\limits_{3\Pi/4}^{\Pi/4} tan^2x.e^{-x}dx+\int\limits_{3\Pi/4}^{\Pi/4}tan x.e^{-x}dx=I1+I2$
 tính I1=$\int\limits_{3\Pi/4}^{\Pi/4}(\frac{1}{cos^2 x}-1).e^{-x}dx$     (đến đây bạn tích phân từng phần là đc thui)
tính I2 =   - $\int\limits_{3\Pi/4}^{\Pi/4}\frac{e^{-x}.d(cos x)}{cos x}$
(bạn tính tiếp nha ) 

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