@Carl Love 

Hi again,

I know only that polar coordinates are not cartesian and that they include angles. I am not on my sixth semester and I had calculus in my first semester, so it has been a while. 

We never had multi-variable calculus, but I was pretty good at the basic calculus we covered in the first semester. 

We used Calculus: Early Transcendentals", Seventh Edition, Edwards and Penny, Pearson at the time.

@Carl Love Hi again!

Sorry for the late reply and thank you a lot for the help. 

Your interpretation of the rectangular region is correct, I am not sure how you transformed the coordinates into polar coordinates, so some explanation would definitely be welcome!

I am in the middle of my chemical engineering programme, and I am not fluent in integration at all. It seems to be an important part of the study... Seeing as you are quite good at the subject, do you happen to know, and can recommend a book or two, which could be a good start with to understand the principles, and maybe make the subject easier to imagine?

 

I am sorry for confusing you, I am actually helping my mom with this and my mom meant something else and wrote something completely different...

The x value from the integral is not =B/2, but its interval is from 0 to B/2

y has then interval from 0 to b/2. 

I wrote the code into maple but I cannot expand it, it give me this:

2*N*u*(int(-4*y^2*ln(2)+4*y^2*ln(b+sqrt(b^2+4*y^2))-2*y^2*ln(y^2)+b*sqrt(b^2+4*y^2), y = 0 .. (1/2)*B))/(Pi*d^2)

instead of expanding it fully, it only integrates once, for x. Is it even possible to expand it?

@Carl Love 

@Carl Love 
Thanks a lot, but is there any solution to this?