- #1
krindik
- 65
- 1
Can somebody help me with this.
[tex]\int_{-\infty}^{\infty} \, \frac{\sin{x}}{x} \, dx[/tex]
Could u pls advice me with the procedure to follow not only the answer?
1. Use complex numbers as there is a pole of order=0 at x=0
[tex]
\int_{-\infty}^{\infty} \! f(x) \, dx = 2\pi\, i \sum_{res\, upper\, hp} {f(x)} \, + \pi\, i \sum_{res\, real\, axis} {f(x)}
[/tex]
which give 0 as the answer
2. Expand by sin(x) by Taylor series around 0 and multiply by x this gives a divergent series
Couldn't figure out which is correct?
Thanks
Homework Statement
[tex]\int_{-\infty}^{\infty} \, \frac{\sin{x}}{x} \, dx[/tex]
Could u pls advice me with the procedure to follow not only the answer?
The Attempt at a Solution
1. Use complex numbers as there is a pole of order=0 at x=0
[tex]
\int_{-\infty}^{\infty} \! f(x) \, dx = 2\pi\, i \sum_{res\, upper\, hp} {f(x)} \, + \pi\, i \sum_{res\, real\, axis} {f(x)}
[/tex]
which give 0 as the answer
2. Expand by sin(x) by Taylor series around 0 and multiply by x this gives a divergent series
Couldn't figure out which is correct?
Thanks