- #1
jeebs
- 325
- 4
Hi,
I need to evaluate [tex]\int e\stackrel{-(r/R)}{}sin(qr/h)dr[/tex] between r=0 and r=[tex]\infty[/tex] but I keep getting stuck.
I hae tried integrating by parts but the integral just keeps getting more complicated, and I have tried substituting in sin(x) = (1/2i)(e^ix - e^-ix) but that gave me the result that the whole thing is equal to infinity, which I know to be wrong.
can anybody suggest some sort of method or substitution that I could use?
this is driving me up the wall now.
cheers.
I need to evaluate [tex]\int e\stackrel{-(r/R)}{}sin(qr/h)dr[/tex] between r=0 and r=[tex]\infty[/tex] but I keep getting stuck.
I hae tried integrating by parts but the integral just keeps getting more complicated, and I have tried substituting in sin(x) = (1/2i)(e^ix - e^-ix) but that gave me the result that the whole thing is equal to infinity, which I know to be wrong.
can anybody suggest some sort of method or substitution that I could use?
this is driving me up the wall now.
cheers.