Recent content by sarahisme

ok, i get now get http://img136.imageshack.us/img136/764/picture24tf0.png

i do i do, lol, any parting hints? ;)

hmm ok i think i see now... ok i get this answer for the solution to the sub-problem now http://img85.imageshack.us/img85/9914/picture23hb4.png does that look better? :)

isnt it because cosh(n pi) is never zero and sinh(n pi) is equal to 0 for n = 0 and so since we need the whole expression to be equal to 0 therefore k_1 needs to be 0?

ok, well what i did was try to solve http://img154.imageshack.us/img154/5458/picture19sw2.png which has general solution http://img154.imageshack.us/img154/8532/picture20ix0.png and applying the BC Y(1) = 0 gives http://img138.imageshack.us/img138/101/picture21ap4.png...

HELP!: Laplace 2D equation on a square Hi everyone, I quite get the answer out for this question and i just feel like i have been beating my head into a wall for 4 hours! aghh... http://img167.imageshack.us/img167/3579/picture12vv7.png I get stuck when i try to solve the sub-problem...

ah yep i see now. i need to be more careful with the n = 1 term when alpha = pi thanks for the help! :D Sarah

Hello peoples, I think this is a trick question... well sort of :P http://img133.imageshack.us/img133/472/picture8ox1.png for part (a) i get that the cosine Fourier Series for f(x) = cos(x) to be: http://img138.imageshack.us/img138/6114/picture9sq2.png i hope that is ok, but its...

yeah, we did Riemann integration about a year and half ago i think, in a first analysis class I'm pretty sure.

not for a couple of years i don't think... thanks for the help by the way :)

http://img136.imageshack.us/img136/8739/picture6tt5.png however i do have one question, are we allowed to substitute the integral inside the summation? (i am have never heard of any rules telling me whether this is or is not allowed...)

it does actually, hold on... i'll post my answer in a sec

Hey all, I am unsure how to do this problem... i find problems where i have to derive things quite difficult! :P http://img143.imageshack.us/img143/744/picture2ao8.png this is the Full Fourier series i think and so the Fourier coeffiecients would be given by...

i just differentiated u(x,y) with respect to x then respect to y and that gave me A(u) but doesn't that seem to simple? i mean, there is no PDE stuff involved really... :S

hmmm i have no idea where to even start with this problem, i cannot find any examples that are similar or anything like that anywhere! http://img147.imageshack.us/img147/2319/picture18ur9.png anyone got an idea as to a good first step to take? thanks sarah :) edit: i tryed something wild...