- #1
mikky05v
- 53
- 0
Homework Statement
Use polar coordinates to set up and evaluate the double integral f(x,y) = e-(x2+y2)/2 R: x2+y2≤25, x≥0
The Attempt at a Solution
First I just want to make sure I'm understanding this
my double integral would be
∫[itex]^{\pi/2}_{-\pi/2}[/itex] because x≥0 ∫[itex]^{5}_{0}[/itex] because my radius is 5 (e-(x2+y2)/2) r dr dθ
and then my inside would become ∫[itex]^{\pi/2}_{-\pi/2}[/itex] ∫[itex]^{5}_{0}[/itex] (e-r2/2) r dr dθ
can anyone confirm for me that this is correct and give me a brief break down on integrating.
obviously I would use substitution because I have r er2 but the -1/2 is throwing me a bit when it comes to the substitution.
Also how would i go about changing the limits while I'm substituting.
u= r2
du = 2r dr
isn't there something I have to do with my limits of integration that involves my u and du?