My integration skill is very poor, there a many integral that I can't solve, for example:(adsbygoogle = window.adsbygoogle || []).push({});

$$\int_{0}^{\infty}\frac{\sin^{2n+1} x}{x} dx$$

$$\int_{0}^{\infty}\frac{\cos ax-\cos bx}{x} dx$$

but my friend could solve them very quickly, so may I wonder if there are any books about technique for proper and improper riemann integral? Also what is the best way to master integration?

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# Poor integration technique

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