check my work, please. I don't see my mistake, but the result is wrong :(

Question

loser66 · Answer

attachment

loser66 · Answer

The Area is supposed to be 6, right? but I don't know where my mistake is!!

loser66 · Answer

@mathmale @.Sam.

irishboy123 · Answer

the answer is 2 in x-y also

and it is the absolute val of the Jacobian...!

loser66 · Answer

It should be 6 @IrishBoy123

irishboy123 · Answer

loser66 · Answer

oh, | jacobian| gives us 1/3

loser66 · Answer

then, the answer is 2 because the scale of u,v is different from the scale of xy, right?

irishboy123 · Answer

yes

loser66 · Answer

I got you!! thank you so so so much. !!! hehehe

loser66 · Answer

I have much more problem in cal3. I want to review it. help me? huh?

irishboy123 · Answer

i found this brilliant vid recently on where the Jacobian comes from.  i'll post a link here.

irishboy123 · Answer

loser66 · Answer

Thank you, friend!!