- #1
DocZaius
- 365
- 11
Integration by parts not working for a particular integral
When I attempt to use the method of integration by parts on the below integral, I don't get anywhere since I only arrive at the statement a = -b +b -a where a is the integral and b is the boundary term.
[itex]\int e^{-x}\text{Cos}[k x]dx=-e^{-x}(-\text{Cos}[k x])-\left(-e^{-x}(-\text{Cos}[k x])-\int e^{-x}\text{Cos}[k x]dx\right)[/itex]
Do you know of another method I could use to evaluate this integral?
Thanks
When I attempt to use the method of integration by parts on the below integral, I don't get anywhere since I only arrive at the statement a = -b +b -a where a is the integral and b is the boundary term.
[itex]\int e^{-x}\text{Cos}[k x]dx=-e^{-x}(-\text{Cos}[k x])-\left(-e^{-x}(-\text{Cos}[k x])-\int e^{-x}\text{Cos}[k x]dx\right)[/itex]
Do you know of another method I could use to evaluate this integral?
Thanks
Last edited: