# Changing to polar co-ordinates in double integration

• Jan 15th 2009, 04:26 PM
chella182
Changing to polar co-ordinates in double integration
Okay, so I've asked a specific question on this on here before, but I still don't get it. Can someone help explain it to me? I have the exam with it on tomorrow at 2pm (Crying)
• Jan 15th 2009, 04:42 PM
Mathstud28
Quote:

Originally Posted by chella182
Okay, so I've asked a specific question on this on here before, but I still don't get it. Can someone help explain it to me? I have the exam with it on tomorrow at 2pm (Crying)

Hello Chella :)...unfortunately this site is for homework help, not full lessons. Do you have any specific examples? The most basic concept is to convert to polar coordinates using the coordinate changes $\left(\begin{array}{cc} x \\ y \end{array}\right)\mapsto\left(\begin{array}{cc} r\cos(\theta) \\ r\sin(\theta)\end{array}\right)$ remembering to adjust the limits of integration in this new coordinate system...also don't forget the Jacobian of this variable change $r$
• Jan 16th 2009, 02:59 AM
chella182
Yeahhh it's changing the limits I don't understand haha. Nevermind.