PDE problem : diffusion equation! help!

Hi all,

I am stuggling with this question ...

http://img86.imageshack.us/img86/2662/picture6fb5.png

so far i have only tried part (a), but since i can't see how to do that so far... :(

ok so what to do...

do we first look at an 'associated problem' ? ... something like

http://img245.imageshack.us/img245/4544/picture7vu3.png


lol, this stuff is all quite confusing :confused:

-Sarah

hmm ok i tryed some more and i come up with this answer:

http://img301.imageshack.us/img301/3903/picture8cm8.png

however i don't know how to simplify it from here, i have looked up integral tables and still no luck. any suggestions guys? lol assuming the answer is right in the first place! :P

cheers
-sarah

nm, i worked it out!