Techniques of Integration - Cyclic Integration by Parts

Techniques of Integration - Cyclic Integration by Parts

1. \(\displaystyle \displaystyle\int{x\sin 3x\,\mathrm{d}x}\)
2. \(\displaystyle \displaystyle\int{x\ln x\,\mathrm{d}x}\)
3. \(\displaystyle \displaystyle\int{\ln x\,\mathrm{d}x}\)
4. \(\displaystyle \displaystyle\int{\frac{\ln x}{x}\,\mathrm{d}x}\)
5. \(\displaystyle \displaystyle\int{\sin (\ln x)\,\mathrm{d}x}\)

6. \(\displaystyle \displaystyle\int{{{2}^{\ln x}}\,\mathrm{d}x}\)
7. \(\displaystyle \displaystyle\int{{{\tan }^{-1}}x\,\mathrm{d}x}\)
8. \(\displaystyle \displaystyle\int{x{{\sin }^{2}}x\,\mathrm{d}x}\)
9. \(\displaystyle \displaystyle\int{\frac{x}{{{\cos }^{2}}5x}\,\mathrm{d}x}\)

10. \(\displaystyle \displaystyle\int{\text{cose}{{\text{c}}^{3}}x\,\mathrm{d}x}\)
11. \(\displaystyle \displaystyle\int{\frac{1}{{{\cos }^{3}}3x}\,\mathrm{d}x}\)
12. \(\displaystyle \displaystyle\int{\sec x\tan x{{e}^{\text{sec}x}}\,\mathrm{d}x}\)

Solution:

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Answer:(1) \(-\frac{x\cos3x}{3}+\frac{\sin3x}{9}+C\) (2) \(\frac{x^2}{2}\ln x-\frac{x^2}{4}+C\) (3) \(x\ln x-x+C\) (4) \(\frac12(\ln x)^2+C\) (5) \(\frac{x}{2}[\sin(\ln x)-\cos(\ln x)]+C\) (6) \(\frac{x2^{\ln x}}{1+\ln2}+C\) (7) \(x\tan^{-1}x-\frac12\ln(1+x^2)+C\) (8) \(\frac{x^2}{4}-\frac{x\sin2x}{4}-\frac{\cos2x}{8}+C\) (9) \(\frac{x\tan5x}{5}+\frac1{25}\ln|\cos5x|+C\) (10) \(-\frac12\csc x\cot x+\frac12\ln|\csc x-\cot x|+C\) (11) \(\frac16\sec3x\tan3x+\frac16\ln|\sec3x+\tan3x|+C\) (12) \(\mathrm e^{\sec x}+C\).

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