- #1
Blamo_slamo
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Homework Statement
By changing to polar coordinates, evaluate:
[tex]\int[/tex][tex]\int[/tex] e ^(-[tex]\sqrt{x^2 + y^2}[/tex]) dx dy
Both integrals go from 0 --> infinity
Homework Equations
r = [tex]\sqrt{x^2 + y^2}[/tex]
x = r cos[tex]\theta[/tex]
y = r sin[tex]\theta[/tex]
Using the Jacobian to switch to polar coord we get:
J = r d[tex]\theta[/tex] dr
The Attempt at a Solution
[tex]\int[/tex][tex]\int[/tex] e ^ (-r) r d[tex]\theta[/tex] dr
I have my integral set up, but I have no clue what the integration limits are. My prof. said this is always the hardest part of multiple integrals, any help hinting in the right direction would be great!
Thanks!