Question

Double Integral:

Answer 1

\[\int\limits_{0}^{1}\int\limits_{0}^{1} xye^xe^y dydx\]

Answer 2

i just can't quite figure this one out! Anyone willing to help?

Answer 3

\[\int\limits_{0}^{1}\int\limits_{0}^{1}xye^xe^ydydx=\int\limits_{0}^{1}ye^ydy \int\limits_{0}^{1}xe^xdx\] Because the "ye^y dy" part doesn't depend on x, it's like a constant so you can tak it out of the integral. Now you have a multiplication of two integrals that can be done by Integration By Parts... your typical xe^x integral :)

Answer 4

The answer will be 1 btw

Answer 5

\(\int y\cdot e^{y}\;dy = \int y\;d\left(e^{y}\right) = y\cdot e^{y} - \int e^{y}\;dy\)

Answer 6

Do you need more help

Answer 7

@kirbykirby i really like that answer as you just answered another of my questions!! But i need some clarification if possible:

Answer 8

Okay so basically you just said that the double integral equals the multiple of the integral of each variable?

Answer 9

Yes, In this case you can do it because the term \[ye^ydy\]in the integral doesn't depend on x (recall you can just switch the dydx to dxdy and not worry about the bounds of integration since they are constants and the same for both integrals).
So since ye^y dy doesn't depend on x, it acts like a constant (with respect to x), so you can just move it out of the integral

Answer 10

AH!!!!!!!!!!

Answer 11

You @kirbykirby are a genius my good sir!

Answer 12

:) no problem!